WEBVTT
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Hi everyone, welcome back to Mohivate.
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I'm Dr.
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Mohi Saraugi, a GP by profession, but here I'm swapping prescriptions for perspective.
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I want to begin today by taking you to the southwest of England.
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A few years ago, I lived in Cornwall.
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For those who don't know it, Cornwall is that long finger of coastline reaching out into the Atlantic, right at the very tip of the country, where the land finally gives way to the sea.
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And I was fortunate enough to watch that sea in all its moods and in all its times, always teaching me that each time the waves fall, they never fail to rise again.
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I think water has always been more than a substance to us.
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Long before we understood the first thing about it, we felt it.
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Almost every culture on earth has treated water as sacred, a symbol of life, of purity, of renewal, of washing clean and beginning again.
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People are baptized in it, we are cleansed by it.
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We speak of being swept away, of feeling flooded, of washing the slate clean, of calm waters and troubled ones.
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Water has always been the mirror.
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We hold up to our own emotions and to our own longing to start afresh.
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It carries our deepest ideas about beginnings and about being made new.
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And of course, it is not only a symbol, it is the most literal life there is.
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You are yourself mostly water.
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You cannot go more than a few days without it.
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And you have almost certainly been told more times than you can count to drink more of it.
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So water is life.
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That is the oldest truth we have.
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And yet, for almost all of human history, that same life-giving water, the very symbol of purity, could quietly kill you, and you would never have known why.
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Because water has two faces.
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It can sustain life and it can carry death.
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It can be calm and it can be chaos.
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And for all the meaning we pour into it, water might also be the single most underrated, most overlooked, most miraculous thing we have.
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The plain glass we barely give a second thought to.
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So today, let's follow water a little differently.
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This episode is a story in two halves.
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First, what was hidden inside our water that we never knew and how we made it safe.
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And then what has found its way back into it today.
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So let's begin.
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First, let's understand what a miracle safe water really is.
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And to do that, I'll ask you to picture a world without it.
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So let's go to London in the summer of 1854.
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London then was the largest city on earth and it was buckling under its own weight.
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More than 2 million people were crammed into a city built for a fraction of that, and there was no real system to carry away everything a city of 2 million people produces.
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Beneath the houses sat cesspools, great brick pits of human waste sitting right there under the floorboards.
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When they overflowed, which was often, it seeped into the cellars, ran through the streets, and soaked into the ground.
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The river Thames itself had become little more than an open sewer.
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The smell of London in summer was so famous that a few years later it earned its own nickname, The Great Stink.
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Now, into this crowded, filthy, sweltering city came a visitor that the 19th century had learned to dread above almost any other.
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And thus begins the story I want to tell you today.
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It starts with a baby.
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At number 40 Broad Street in Soho, London, a little girl, only a few months old, felt terribly ill at the end of August 1854.
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Her exhausted mother washed out the baby's soil clothes in a bucket of water and tipped that dirty water into the cesspool in front of the house.
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That was all.
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One tired mother emptying her bucket.
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But that cesspool sat just a few feet from a well, and that well fed the most popular water pump in the neighborhood: the Broad Street pump.
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Cool, clear, sweet-tasting water that people walked streets out of their way to collect.
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Within 10 days, more than 500 people in that small tangle of streets were dead.
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People collapsed in their homes, in the road, at their workbenches.
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The killer was cholera.
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And cholera is a horror.
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A person could be perfectly well at breakfast and dead by dinner.
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It works to sudden, violent, unstoppable diarrhoea, so severe that the body pours out liters of fluid in a matter of hours.
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In the outbreaks of that century, tens of thousands died.
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And what made it even more terrifying was this.
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Nobody knew how it spread.
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The explanation everyone trusted had a name.
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Almost everyone, including the finest doctors and scientists of the age, believed that cholera rose out of foul, poisonous air.
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The stink itself from the sewage and the rot was thought to be what made you ill.
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And honestly, you can see why they believed it.
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The poorest, most crowded, worst-smelling districts were reported to have the most disease.
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So the logic seemed to close neatly.
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Bad air, bad disease.
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And it was completely wrong.
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But it was believed so deeply that to question it was to sound like a crank.
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Until one man was about to question it.
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His name was John Snow.
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He was a physician living in Soho in the very heart of London, right where the outbreak was unfolding.
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He was already well known for his work with anesthesia.
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In fact, he had given chloroform to Queen Victoria for the birth of two of her children.
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So he was no fringe figure.
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He was a respected doctor.
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But he had a nagging, unfashionable idea.
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He simply did not believe the bad air theory.
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He had watched cholera closely in earlier outbreaks and the pattern never fit.
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He kept asking the same questions.
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If this disease was breathed in from the air, why did it strike the gut so violently and so specifically?
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Why did one person fall ill while the person beside them, breathing the very same air, stayed perfectly well?
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Years earlier, in 1849, he had actually published his answer.
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He suspected cholera was not in the air at all.
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He suspected it was in the water, something you swallowed, and his idea had been more or less ignored.
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The world was quite happy with its bad air.
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And then at the end of August 1854, cholera exploded in his own neighborhood and it became one of the first outbreaks the country had ever seen.
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So Snow began to investigate.
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He walked the streets, knocked on doors, and asked the grieving families one question.
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Where did you get your water?
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And he marked every death on a map.
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Slowly, a shape appeared.
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The deaths clustered thickest around one single point.
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The broad street pump.
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The further you walked from it, the fewer the dead.
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But the truly clever part of his work was the exceptions, the cases that looked wrong until you look closer.
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There was a large workhouse sitting right in the middle of the dead zone, packed with hundreds of people.
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By the logic of the map, it should have been devastated.
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Yet barely a soul inside it died.
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Why?
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Because Snow discovered the workhouse had its own private well.
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Its residents never drank from the Broad Street pump at all.
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And then there was a puzzle in the opposite direction.
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A widow living miles away in the clean, breezy suburb of Hampstead, far from any so hosting, died of cholera.
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It made no sense.
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So Snow went and asked her family, and the answer was extraordinary.
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The widow had once lived on Broad Street years before, and she had so loved the taste of that pump's water that even after moving across London, she had it fetched for her by cart in large bottles, delivered to her door.
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She had drunk from her last delivery just before she died.
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She had, in the saddest possible way, imported her own death from across the city.
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Bad Air could not comfortably explain these patterns.
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Snow's water theory could, and the evidence was becoming very difficult to ignore.
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So Snow took his map and his evidence to the local parish officials and he asked them for one simple thing.
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Take the handle off the Broad Street pump.
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Make it impossible to draw the water.
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Of course, they thought he was probably wrong.
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They were not scientists, and like everyone else, they believed in bad air.
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But the sheer weight of his evidence and perhaps the sheer scale of the dying all around them made them reconsider.
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And so, with far more reluctance than faith, they agreed.
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The very next morning, the handle of the Broad Street pump was unscrewed and carried away.
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Now I must be honest with you here because Snow was honest about it himself.
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By the time that handle came off, the outbreak was already fading in large part because so many terrified people had already fled the area.
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So we cannot really say the pump handle stopped the epidemic in one heroic stroke.
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That part has become a little more legend than truth.
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But it does not matter because of what that moment represented.
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For the first time, someone had taken an invisible killer that everybody misunderstood, traced it to its exact source using nothing but patient questions and a map, and then acted, That is the moment a whole science was born.
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The study of how disease moves through populations, and it is why Jon Snow is remembered the way he is today.
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Many of you will already know him as the father of modern epidemiology.
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There's one last part of this story I have to tell you because it is my favorite.
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There was a local clergyman, Reverend Henry Whitehead, who knew the people of Soho well, and he thought Snow was completely wrong.
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He was fond of that pump and he set out to prove the water theory was nonsense, going door to door to clear the pump's name.
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But the deeper he dug, the more the evidence pointed exactly where Snow said it would.
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And here is a measure of the man.
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Whitehead followed the truth instead of his pride.
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He changed his mind and then he did something important.
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Because he knew the neighborhood so well, it was Whitehead who traced the whole outbreak back to its very beginning.
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Back to number 40 Broad Street, back to a sick baby and a bucket and a cesspool beside a well.
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He found the sauce of the sauce.
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And I love this because a man who set out to prove someone wrong had the honesty to admit it when he found they were right.
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There's something rather beautiful in that, and it is partly why I wanted to share this story with you.
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Because it is, in one person, the whole spirit of good science.
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Jon Snow died in 1858 at just 45 before the world fully accepted what he had shown.
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But accepted, eventually it did, and in the decades that followed, cities began the enormous, unglamorous work of separating their sewage from their drinking water, building proper sewers, filtering and cleaning what people drank.
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And the results were extraordinary.
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Cholera, typhoid, and the other waterborne killers that had haunted humanity for centuries began in these cities to fade away because of clean water.
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In fact, when the British Medical Journal once asked more than 11,000 readers to choose the greatest medical advance since 1840, they did not choose antibiotics, vaccines, or surgery.
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They chose the sanitary revolution, clean water, and sewage disposal.
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But let's discuss the honest other half of that truth.
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This is not a solved problem and it is not shared equally.
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Even today, around 1 in 4 people on Earth, more than 2 billion of us, still live without safely managed drinking water.
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And unsafe water, sanitation, and hygiene still contribute to at least 1.4 million preventable deaths every year.
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Waterborne diseases are not distant history.
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They are still here.
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This gift, so much of the world is still waiting for.
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In the summer of 2024, in Brixham in Devon, a tiny parasite called Cryptosporidium found its way into the drinking water.
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Tens of thousands of people were suddenly told to boil their water before they could safely drink it.
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People fell ill, and it was serious enough that two years later the water company was fined a record amount for the failure.
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And in late 2025, Tunbridge Wells faced a different kind of water crisis.
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A failure at its treatment works left thousands affected by loss of supply and subsequently a boiled water notice.
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And this is not in the 19th century.
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Here, now, in one of the wealthiest countries on earth.
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And I do not say this to frighten you or to point a finger at any country.
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Water in most developed places is overwhelmingly safe, and it is safe because everything snow set in motion.
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I say it because it is worth remembering that the clean glass of water in your hand is not a law of nature.
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It is a gift built and maintained and defended every single day by people you will never meet, and most of us have maybe never once stopped to be grateful for it.
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And yet there's a strange twist in our story because even though our water, for the most part, is now clean, we have started to worry about the water all over again.
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Only this time, the thing we are worried about is not a germ, it is something we made ourselves.
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Plastic, or to be precise, microplastics, and their even smaller cousins, nanoplastics.
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Microplastics are simply very small pieces of plastic.
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Anything under 5mm, right down to particles smaller than a single cell.
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They break off from the ocean of plastic we have made, the bottles, the packaging, the bags, the clothes, as it slowly wears and crumbles.
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And over the last few decades, they have spread absolutely everywhere.
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They are on the highest mountains, in the deepest sea, in the soil, the rain, and the air.
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They have been found in human blood, even in the placenta.
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And yes, they are in our tap water too.
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And it turns out in even greater amounts in plastic bottled water.
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The numbers here may sound a little alarming.
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So let me give them to you honestly, and then let me be a careful doctor about what they actually mean.
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Researchers have tried to estimate how many of these particles we take in, but the numbers vary enormously depending on how you measure them and particularly on how small a particle your equipment is able to detect.
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Bottled water is certainly not exempt.
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One widely cited study estimated that someone drinking only bottled water could take in tens of thousands more microplastic particles over a year from water alone than someone drinking only from tap.
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Some of those particles may come from the packaging itself.
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Studies suggest that the bottle, the cap, and the repeated mechanical stress of opening and closing it can contribute particles, while heat and prolonged sunlight can increase their release.
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There's a certain irony in that the bottled water we sometimes reach for because it feels cleaner, purer, and safer is not necessarily giving us less plastic at all.
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I want to say that clearly because it matters and because it is so often left out.
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Scientists have become very good at finding these particles and very good at counting them.
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What they have not yet done is prove that the amounts we meet in ordinary life are actually making us ill.
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The World Health Organization looked carefully at microplastics in drinking water and concluded that on the evidence we have so far, there was no clear sign of a risk to health at the levels we typically encounter.
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While being honest, that the science is still young and incomplete.
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And more recently, food safety bodies in Europe and America have said much the same thing.
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The evidence so far is simply not strong enough to draw firm conclusions.
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And this is where I want to be a steady voice because this is a subject that pulls people to two extremes, and in my perspective, both of them are wrong.
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On one side, there are the frightening headlines that studies have reported microplastics in your blood, your brain, your mother's placenta.
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That is genuinely sobering, but detecting a material is not the same thing as demonstrating it is causing disease.
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On the other side, there are voices keen to reassure you that there is absolutely nothing to think about here at all.
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And the honest, grown-up truth sits quietly in the middle holding two ideas at the same time.
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The first idea is this we have not shown that these particles are harming us at the levels we meet in daily life.
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So there is no good reason to lie awake at night or to feel afraid of a glass of water.
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Fear that runs ahead of the evidence helps no one.
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But the second idea is just as important.
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Reports of man-made plastic particles turning up in human tissues, a material that essentially did not exist in our bodies a century ago is reason enough to pay attention and to want to understand it properly.
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Because absence of proof of harm is not the same thing as proof of safety.
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Those are two very different statements, and it would be a mistake to confuse them.
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A person can hold both of those thoughts together without collapsing into either panic or dismissal.
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And here is where our story comes full circle because there is a real echo of Jon Snow in all of this.
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In his day, the danger in the water was invisible too.
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People could see the deaths, but they could not yet prove how, because the science to understand it did not exist yet.
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They were living inside the question before anyone had the answer.
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We are standing in a strangely similar place with microplastics.
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We can now see the particles and count them, but we cannot yet fully read what they mean for us.
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That work is happening right now in laboratories all over the world, and it may be a few years before we truly know.
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And perhaps the most honest thing I can tell you is that this chapter has not been written yet.
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And in the meantime, well, I think we all know a few people who have declared war on plastic.
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The ones at war in the kitchen, guarding the glass jars, refusing to let the children near a plastic cup, plate or bottle, and yet their own phone sits wrapped in a plastic case.
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Half the bathroom is plastic bottles, shampoos, and lotions.
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The children's toys are almost entirely plastic, and the entire fridge is full of food wrapped in plastic.
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The war, it turns out, has very specific borders.
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I say all of this, of course, as someone whose own life is hardly plastic free.
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So take my perspective for what it is worth.
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And finally, where does all of this leave you standing in your kitchen holding a glass of water?
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Let me give you some very calm practical things so that a great deal of worry can safely be set down.
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First, and this is a big one if your tap water is already known to be safe, drink it.
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In most developed countries, such as the UK, your tap Water is held to good standards.
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It is tested again and again all the way to your kitchen.
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So the idea that bottled water is somehow purer or cleaner or better for you is mostly a feeling that has been sold to us, not a fact.
00:22:17.359 --> 00:22:23.920
And as we have seen, the plastic bottle may quietly be adding the very thing you were hoping to avoid.
00:22:24.240 --> 00:22:28.960
Second, if you do use plastic, keep it away from heat.
00:22:29.200 --> 00:22:36.880
A plastic bottle left in a hot car or in direct sunlight all afternoon will shed more particles into the water.
00:22:36.960 --> 00:22:39.920
And in the kitchen, this is the one I would underline.
00:22:40.480 --> 00:22:47.119
Use glass or ceramic rather than plastic containers when heating or microwaving food.
00:22:47.279 --> 00:22:53.519
It's a small, simple change if reducing your plastic exposure is something you want to do.
00:22:53.759 --> 00:22:58.720
Third, if you'd like to go a step further, a simple water filter can help.
00:22:58.880 --> 00:23:06.720
Some filters can reduce the microplastic particles in water, although how well they work depends on the type of filter.
00:23:06.880 --> 00:23:15.440
And honestly, for most people with a safe, regulated water supply, this is an optional extra rather than a necessity.
00:23:15.759 --> 00:23:18.240
A nice to have, not a must.
00:23:18.480 --> 00:23:24.319
And finally, one genuinely useful thing because knowledge is a quiet kind of power.
00:23:24.480 --> 00:23:30.240
If your tap water suddenly changes color, smell or taste, here is what to do.
00:23:30.559 --> 00:23:33.440
First, check another tap or two in your home.
00:23:33.599 --> 00:23:39.279
If it is only the one, the problem is probably your own plumbing, not the supply.
00:23:39.599 --> 00:23:48.880
Then, if you can ask a neighbor if their water is or two, that points to something in the wider network, not just your home.
00:23:49.039 --> 00:23:52.720
And that is exactly when you contact your water company.
00:23:52.960 --> 00:23:58.000
In most places, and certainly in the UK, every home is served by one.
00:23:58.160 --> 00:24:03.359
Their number is on your water bill, the internet, and they are obliged to investigate.
00:24:03.599 --> 00:24:08.240
And here is the reassuring part: the thing that ties back to Brixum.
00:24:08.400 --> 00:24:13.839
When Cryptosporidium caught into that supply, the contamination itself was a failure.
00:24:14.000 --> 00:24:15.680
We should be clear about that.
00:24:15.920 --> 00:24:19.440
But what happened around that failure matters too.
00:24:19.680 --> 00:24:27.920
The problem was quickly detected, people were warned, the supply was investigated, and ultimately the company was held to account.
00:24:28.240 --> 00:24:32.160
Safe water does not mean nothing can ever go wrong.
00:24:32.400 --> 00:24:37.119
It means we build systems designed to detect when it does.
00:24:37.359 --> 00:24:46.000
One last thing worth knowing: if you are ever curious, you can look up the water quality report for your own postcode, usually online.
00:24:46.319 --> 00:24:52.480
Your water company publishes it and it will tell you exactly what is in the water, where you live.
00:24:52.720 --> 00:24:59.519
Most of us never think to look, but it is there if you ever want the reassurance of seeing it for yourself.
00:24:59.759 --> 00:25:13.119
And if the taste is ever really strong, if it smells of fuel, solvents, or chemicals, or if a few people around you are falling unwell, please don't try to make it safe by boiling it.
00:25:13.359 --> 00:25:18.319
Stop using it for drinking and contact your water company immediately.
00:25:18.559 --> 00:25:27.599
That watchfulness, that testing again and again, all the way to your tap is the quiet machinery that keeps the water safe.
00:25:27.759 --> 00:25:32.559
It is Jon Snow's map still being drawn every single day.
00:25:32.880 --> 00:25:37.200
So here we are, back where we began with water.
00:25:37.359 --> 00:25:41.039
Something so ordinary that most of us barely notice it.
00:25:41.200 --> 00:25:45.920
We turn a tap, fill a glass, take a sip, and carry on with our day.
00:25:46.160 --> 00:25:50.880
And yet, behind that simple act lies a remarkable human story.
00:25:51.119 --> 00:26:11.759
The people who asked better questions, the people who were willing to change their minds, the engineers who built the sewers, the scientists who learned what to look for, and the thousands of people, even now, whose work allows the rest of us to turn a tap without giving any of it a second thought.
00:26:11.920 --> 00:26:22.079
I think about that scene Cornwall sometimes and the thing it seemed to teach me over and over again that each time the waves fall, they never fail to rise again.
00:26:22.319 --> 00:26:32.960
Perhaps water has been teaching us something all along to pay attention to what sustains us, to care for it, and every so often to begin again.
00:26:33.279 --> 00:26:40.240
I hope something today stirred a thought or simply made you look at the next glass of water in your hand a little differently.
00:26:40.559 --> 00:26:41.599
Thank you for listening.
00:26:41.759 --> 00:26:42.400
I'm Dr.
00:26:42.480 --> 00:26:42.880
Mohi.
00:26:43.359 --> 00:26:45.519
Until next time, remember this.
00:26:45.839 --> 00:26:50.880
Some of the things that sustain us are so familiar that we stop seeing them.
00:26:51.119 --> 00:26:57.839
And perhaps paying attention to them again is one small way of coming home to ourselves.
00:00:08.640 --> 00:00:11.679
Hi everyone, welcome back to Mohivate.
00:00:11.759 --> 00:00:12.240
I'm Dr.
00:00:12.320 --> 00:00:19.199
Mohi Saraugi, a GP by profession, but here I'm swapping prescriptions for perspective.
00:00:19.440 --> 00:00:23.679
I want to begin today by taking you to the southwest of England.
00:00:23.920 --> 00:00:26.879
A few years ago, I lived in Cornwall.
00:00:27.039 --> 00:00:39.359
For those who don't know it, Cornwall is that long finger of coastline reaching out into the Atlantic, right at the very tip of the country, where the land finally gives way to the sea.
00:00:39.520 --> 00:00:51.359
And I was fortunate enough to watch that sea in all its moods and in all its times, always teaching me that each time the waves fall, they never fail to rise again.
00:00:51.600 --> 00:00:54.880
I think water has always been more than a substance to us.
00:00:55.119 --> 00:00:59.280
Long before we understood the first thing about it, we felt it.
00:00:59.520 --> 00:01:10.000
Almost every culture on earth has treated water as sacred, a symbol of life, of purity, of renewal, of washing clean and beginning again.
00:01:10.239 --> 00:01:13.439
People are baptized in it, we are cleansed by it.
00:01:13.680 --> 00:01:21.439
We speak of being swept away, of feeling flooded, of washing the slate clean, of calm waters and troubled ones.
00:01:21.760 --> 00:01:23.599
Water has always been the mirror.
00:01:23.760 --> 00:01:28.879
We hold up to our own emotions and to our own longing to start afresh.
00:01:29.120 --> 00:01:34.560
It carries our deepest ideas about beginnings and about being made new.
00:01:34.799 --> 00:01:40.560
And of course, it is not only a symbol, it is the most literal life there is.
00:01:40.879 --> 00:01:43.840
You are yourself mostly water.
00:01:44.079 --> 00:01:46.799
You cannot go more than a few days without it.
00:01:46.959 --> 00:01:52.879
And you have almost certainly been told more times than you can count to drink more of it.
00:01:53.120 --> 00:01:54.560
So water is life.
00:01:54.719 --> 00:01:56.879
That is the oldest truth we have.
00:01:57.120 --> 00:02:08.560
And yet, for almost all of human history, that same life-giving water, the very symbol of purity, could quietly kill you, and you would never have known why.
00:02:08.879 --> 00:02:11.199
Because water has two faces.
00:02:11.439 --> 00:02:14.879
It can sustain life and it can carry death.
00:02:15.120 --> 00:02:17.759
It can be calm and it can be chaos.
00:02:17.919 --> 00:02:27.680
And for all the meaning we pour into it, water might also be the single most underrated, most overlooked, most miraculous thing we have.
00:02:27.919 --> 00:02:31.360
The plain glass we barely give a second thought to.
00:02:31.599 --> 00:02:34.879
So today, let's follow water a little differently.
00:02:35.199 --> 00:02:37.840
This episode is a story in two halves.
00:02:38.080 --> 00:02:43.840
First, what was hidden inside our water that we never knew and how we made it safe.
00:02:44.080 --> 00:02:47.759
And then what has found its way back into it today.
00:02:48.000 --> 00:02:49.280
So let's begin.
00:02:49.520 --> 00:02:54.159
First, let's understand what a miracle safe water really is.
00:02:54.319 --> 00:02:58.319
And to do that, I'll ask you to picture a world without it.
00:02:58.560 --> 00:03:02.400
So let's go to London in the summer of 1854.
00:03:02.639 --> 00:03:07.360
London then was the largest city on earth and it was buckling under its own weight.
00:03:07.520 --> 00:03:17.599
More than 2 million people were crammed into a city built for a fraction of that, and there was no real system to carry away everything a city of 2 million people produces.
00:03:18.000 --> 00:03:26.000
Beneath the houses sat cesspools, great brick pits of human waste sitting right there under the floorboards.
00:03:26.159 --> 00:03:33.360
When they overflowed, which was often, it seeped into the cellars, ran through the streets, and soaked into the ground.
00:03:33.599 --> 00:03:38.000
The river Thames itself had become little more than an open sewer.
00:03:38.400 --> 00:03:46.800
The smell of London in summer was so famous that a few years later it earned its own nickname, The Great Stink.
00:03:47.120 --> 00:03:56.639
Now, into this crowded, filthy, sweltering city came a visitor that the 19th century had learned to dread above almost any other.
00:03:56.960 --> 00:04:00.159
And thus begins the story I want to tell you today.
00:04:00.400 --> 00:04:02.080
It starts with a baby.
00:04:02.240 --> 00:04:13.439
At number 40 Broad Street in Soho, London, a little girl, only a few months old, felt terribly ill at the end of August 1854.
00:04:13.680 --> 00:04:23.279
Her exhausted mother washed out the baby's soil clothes in a bucket of water and tipped that dirty water into the cesspool in front of the house.
00:04:23.600 --> 00:04:24.560
That was all.
00:04:24.879 --> 00:04:27.519
One tired mother emptying her bucket.
00:04:27.680 --> 00:04:38.079
But that cesspool sat just a few feet from a well, and that well fed the most popular water pump in the neighborhood: the Broad Street pump.
00:04:38.319 --> 00:04:44.399
Cool, clear, sweet-tasting water that people walked streets out of their way to collect.
00:04:44.639 --> 00:04:50.480
Within 10 days, more than 500 people in that small tangle of streets were dead.
00:04:50.720 --> 00:04:54.879
People collapsed in their homes, in the road, at their workbenches.
00:04:55.199 --> 00:04:57.120
The killer was cholera.
00:04:57.360 --> 00:04:59.040
And cholera is a horror.
00:04:59.360 --> 00:05:03.279
A person could be perfectly well at breakfast and dead by dinner.
00:05:03.519 --> 00:05:12.879
It works to sudden, violent, unstoppable diarrhoea, so severe that the body pours out liters of fluid in a matter of hours.
00:05:13.040 --> 00:05:17.120
In the outbreaks of that century, tens of thousands died.
00:05:17.199 --> 00:05:20.480
And what made it even more terrifying was this.
00:05:20.800 --> 00:05:22.959
Nobody knew how it spread.
00:05:23.199 --> 00:05:26.399
The explanation everyone trusted had a name.
00:05:29.759 --> 00:05:38.560
Almost everyone, including the finest doctors and scientists of the age, believed that cholera rose out of foul, poisonous air.
00:05:38.800 --> 00:05:44.079
The stink itself from the sewage and the rot was thought to be what made you ill.
00:05:44.240 --> 00:05:47.040
And honestly, you can see why they believed it.
00:05:47.279 --> 00:05:53.199
The poorest, most crowded, worst-smelling districts were reported to have the most disease.
00:05:53.360 --> 00:05:55.680
So the logic seemed to close neatly.
00:05:55.920 --> 00:05:58.000
Bad air, bad disease.
00:05:58.240 --> 00:06:00.319
And it was completely wrong.
00:06:00.560 --> 00:06:05.600
But it was believed so deeply that to question it was to sound like a crank.
00:06:05.839 --> 00:06:09.120
Until one man was about to question it.
00:06:09.360 --> 00:06:11.360
His name was John Snow.
00:06:11.519 --> 00:06:17.920
He was a physician living in Soho in the very heart of London, right where the outbreak was unfolding.
00:06:18.079 --> 00:06:21.199
He was already well known for his work with anesthesia.
00:06:21.439 --> 00:06:26.720
In fact, he had given chloroform to Queen Victoria for the birth of two of her children.
00:06:26.879 --> 00:06:28.560
So he was no fringe figure.
00:06:28.720 --> 00:06:30.480
He was a respected doctor.
00:06:30.720 --> 00:06:33.920
But he had a nagging, unfashionable idea.
00:06:34.160 --> 00:06:37.120
He simply did not believe the bad air theory.
00:06:37.360 --> 00:06:42.240
He had watched cholera closely in earlier outbreaks and the pattern never fit.
00:06:42.399 --> 00:06:44.720
He kept asking the same questions.
00:06:44.959 --> 00:06:52.800
If this disease was breathed in from the air, why did it strike the gut so violently and so specifically?
00:06:52.959 --> 00:07:00.319
Why did one person fall ill while the person beside them, breathing the very same air, stayed perfectly well?
00:07:00.560 --> 00:07:05.279
Years earlier, in 1849, he had actually published his answer.
00:07:05.519 --> 00:07:08.720
He suspected cholera was not in the air at all.
00:07:08.959 --> 00:07:15.600
He suspected it was in the water, something you swallowed, and his idea had been more or less ignored.
00:07:15.759 --> 00:07:18.399
The world was quite happy with its bad air.
00:07:18.639 --> 00:07:29.439
And then at the end of August 1854, cholera exploded in his own neighborhood and it became one of the first outbreaks the country had ever seen.
00:07:29.600 --> 00:07:31.759
So Snow began to investigate.
00:07:32.000 --> 00:07:37.759
He walked the streets, knocked on doors, and asked the grieving families one question.
00:07:38.079 --> 00:07:39.839
Where did you get your water?
00:07:40.079 --> 00:07:42.399
And he marked every death on a map.
00:07:42.639 --> 00:07:44.639
Slowly, a shape appeared.
00:07:44.879 --> 00:07:48.800
The deaths clustered thickest around one single point.
00:07:49.120 --> 00:07:50.879
The broad street pump.
00:07:51.120 --> 00:07:54.399
The further you walked from it, the fewer the dead.
00:07:54.560 --> 00:08:02.319
But the truly clever part of his work was the exceptions, the cases that looked wrong until you look closer.
00:08:02.560 --> 00:08:07.759
There was a large workhouse sitting right in the middle of the dead zone, packed with hundreds of people.
00:08:08.000 --> 00:08:11.120
By the logic of the map, it should have been devastated.
00:08:11.519 --> 00:08:14.319
Yet barely a soul inside it died.
00:08:14.560 --> 00:08:15.040
Why?
00:08:15.279 --> 00:08:20.160
Because Snow discovered the workhouse had its own private well.
00:08:20.399 --> 00:08:24.399
Its residents never drank from the Broad Street pump at all.
00:08:24.639 --> 00:08:27.360
And then there was a puzzle in the opposite direction.
00:08:27.600 --> 00:08:36.320
A widow living miles away in the clean, breezy suburb of Hampstead, far from any so hosting, died of cholera.
00:08:36.559 --> 00:08:37.840
It made no sense.
00:08:38.000 --> 00:08:42.879
So Snow went and asked her family, and the answer was extraordinary.
00:08:43.120 --> 00:08:58.559
The widow had once lived on Broad Street years before, and she had so loved the taste of that pump's water that even after moving across London, she had it fetched for her by cart in large bottles, delivered to her door.
00:08:58.799 --> 00:09:02.720
She had drunk from her last delivery just before she died.
00:09:02.960 --> 00:09:08.799
She had, in the saddest possible way, imported her own death from across the city.
00:09:09.120 --> 00:09:12.399
Bad Air could not comfortably explain these patterns.
00:09:12.639 --> 00:09:17.919
Snow's water theory could, and the evidence was becoming very difficult to ignore.
00:09:18.080 --> 00:09:25.360
So Snow took his map and his evidence to the local parish officials and he asked them for one simple thing.
00:09:25.600 --> 00:09:28.879
Take the handle off the Broad Street pump.
00:09:29.120 --> 00:09:31.360
Make it impossible to draw the water.
00:09:31.519 --> 00:09:34.240
Of course, they thought he was probably wrong.
00:09:34.399 --> 00:09:39.120
They were not scientists, and like everyone else, they believed in bad air.
00:09:39.279 --> 00:09:46.639
But the sheer weight of his evidence and perhaps the sheer scale of the dying all around them made them reconsider.
00:09:46.960 --> 00:09:51.440
And so, with far more reluctance than faith, they agreed.
00:09:51.679 --> 00:09:57.840
The very next morning, the handle of the Broad Street pump was unscrewed and carried away.
00:09:58.080 --> 00:10:03.200
Now I must be honest with you here because Snow was honest about it himself.
00:10:03.440 --> 00:10:12.720
By the time that handle came off, the outbreak was already fading in large part because so many terrified people had already fled the area.
00:10:12.960 --> 00:10:19.120
So we cannot really say the pump handle stopped the epidemic in one heroic stroke.
00:10:19.440 --> 00:10:23.039
That part has become a little more legend than truth.
00:10:23.200 --> 00:10:27.200
But it does not matter because of what that moment represented.
00:10:27.440 --> 00:10:44.559
For the first time, someone had taken an invisible killer that everybody misunderstood, traced it to its exact source using nothing but patient questions and a map, and then acted, That is the moment a whole science was born.
00:10:44.720 --> 00:10:53.039
The study of how disease moves through populations, and it is why Jon Snow is remembered the way he is today.
00:10:53.279 --> 00:10:57.840
Many of you will already know him as the father of modern epidemiology.
00:10:58.080 --> 00:11:02.639
There's one last part of this story I have to tell you because it is my favorite.
00:11:03.039 --> 00:11:11.360
There was a local clergyman, Reverend Henry Whitehead, who knew the people of Soho well, and he thought Snow was completely wrong.
00:11:11.600 --> 00:11:19.519
He was fond of that pump and he set out to prove the water theory was nonsense, going door to door to clear the pump's name.
00:11:19.679 --> 00:11:26.000
But the deeper he dug, the more the evidence pointed exactly where Snow said it would.
00:11:26.159 --> 00:11:28.000
And here is a measure of the man.
00:11:28.240 --> 00:11:31.600
Whitehead followed the truth instead of his pride.
00:11:31.919 --> 00:11:35.279
He changed his mind and then he did something important.
00:11:35.600 --> 00:11:43.600
Because he knew the neighborhood so well, it was Whitehead who traced the whole outbreak back to its very beginning.
00:11:43.919 --> 00:11:51.679
Back to number 40 Broad Street, back to a sick baby and a bucket and a cesspool beside a well.
00:11:52.080 --> 00:11:54.720
He found the sauce of the sauce.
00:11:55.039 --> 00:12:02.879
And I love this because a man who set out to prove someone wrong had the honesty to admit it when he found they were right.
00:12:03.120 --> 00:12:09.120
There's something rather beautiful in that, and it is partly why I wanted to share this story with you.
00:12:09.360 --> 00:12:14.399
Because it is, in one person, the whole spirit of good science.
00:12:14.720 --> 00:12:22.000
Jon Snow died in 1858 at just 45 before the world fully accepted what he had shown.
00:12:22.159 --> 00:12:38.080
But accepted, eventually it did, and in the decades that followed, cities began the enormous, unglamorous work of separating their sewage from their drinking water, building proper sewers, filtering and cleaning what people drank.
00:12:38.320 --> 00:12:40.480
And the results were extraordinary.
00:12:40.720 --> 00:12:52.000
Cholera, typhoid, and the other waterborne killers that had haunted humanity for centuries began in these cities to fade away because of clean water.
00:12:52.240 --> 00:13:06.879
In fact, when the British Medical Journal once asked more than 11,000 readers to choose the greatest medical advance since 1840, they did not choose antibiotics, vaccines, or surgery.
00:13:07.120 --> 00:13:12.720
They chose the sanitary revolution, clean water, and sewage disposal.
00:13:12.960 --> 00:13:16.240
But let's discuss the honest other half of that truth.
00:13:16.480 --> 00:13:20.480
This is not a solved problem and it is not shared equally.
00:13:20.720 --> 00:13:29.440
Even today, around 1 in 4 people on Earth, more than 2 billion of us, still live without safely managed drinking water.
00:13:29.679 --> 00:13:39.039
And unsafe water, sanitation, and hygiene still contribute to at least 1.4 million preventable deaths every year.
00:13:39.279 --> 00:13:42.559
Waterborne diseases are not distant history.
00:13:42.720 --> 00:13:44.000
They are still here.
00:13:44.320 --> 00:13:48.000
This gift, so much of the world is still waiting for.
00:13:48.240 --> 00:13:57.519
In the summer of 2024, in Brixham in Devon, a tiny parasite called Cryptosporidium found its way into the drinking water.
00:13:57.759 --> 00:14:03.600
Tens of thousands of people were suddenly told to boil their water before they could safely drink it.
00:14:03.840 --> 00:14:12.320
People fell ill, and it was serious enough that two years later the water company was fined a record amount for the failure.
00:14:12.480 --> 00:14:18.320
And in late 2025, Tunbridge Wells faced a different kind of water crisis.
00:14:18.559 --> 00:14:28.000
A failure at its treatment works left thousands affected by loss of supply and subsequently a boiled water notice.
00:14:28.159 --> 00:14:30.799
And this is not in the 19th century.
00:14:31.120 --> 00:14:34.799
Here, now, in one of the wealthiest countries on earth.
00:14:34.960 --> 00:14:39.600
And I do not say this to frighten you or to point a finger at any country.
00:14:39.919 --> 00:14:48.559
Water in most developed places is overwhelmingly safe, and it is safe because everything snow set in motion.
00:14:48.799 --> 00:14:55.600
I say it because it is worth remembering that the clean glass of water in your hand is not a law of nature.
00:14:55.840 --> 00:15:08.559
It is a gift built and maintained and defended every single day by people you will never meet, and most of us have maybe never once stopped to be grateful for it.
00:15:08.799 --> 00:15:19.600
And yet there's a strange twist in our story because even though our water, for the most part, is now clean, we have started to worry about the water all over again.
00:15:19.840 --> 00:15:26.960
Only this time, the thing we are worried about is not a germ, it is something we made ourselves.
00:15:27.519 --> 00:15:35.120
Plastic, or to be precise, microplastics, and their even smaller cousins, nanoplastics.
00:15:35.360 --> 00:15:38.960
Microplastics are simply very small pieces of plastic.
00:15:39.200 --> 00:15:45.039
Anything under 5mm, right down to particles smaller than a single cell.
00:15:45.200 --> 00:15:54.879
They break off from the ocean of plastic we have made, the bottles, the packaging, the bags, the clothes, as it slowly wears and crumbles.
00:15:55.200 --> 00:15:59.600
And over the last few decades, they have spread absolutely everywhere.
00:15:59.759 --> 00:16:05.840
They are on the highest mountains, in the deepest sea, in the soil, the rain, and the air.
00:16:06.080 --> 00:16:09.600
They have been found in human blood, even in the placenta.
00:16:09.759 --> 00:16:12.799
And yes, they are in our tap water too.
00:16:13.039 --> 00:16:18.720
And it turns out in even greater amounts in plastic bottled water.
00:16:18.960 --> 00:16:21.440
The numbers here may sound a little alarming.
00:16:21.600 --> 00:16:28.240
So let me give them to you honestly, and then let me be a careful doctor about what they actually mean.
00:16:28.480 --> 00:16:42.320
Researchers have tried to estimate how many of these particles we take in, but the numbers vary enormously depending on how you measure them and particularly on how small a particle your equipment is able to detect.
00:16:42.639 --> 00:16:45.679
Bottled water is certainly not exempt.
00:16:45.919 --> 00:17:01.039
One widely cited study estimated that someone drinking only bottled water could take in tens of thousands more microplastic particles over a year from water alone than someone drinking only from tap.
00:17:01.519 --> 00:17:04.720
Some of those particles may come from the packaging itself.
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Studies suggest that the bottle, the cap, and the repeated mechanical stress of opening and closing it can contribute particles, while heat and prolonged sunlight can increase their release.
00:17:19.119 --> 00:17:31.599
There's a certain irony in that the bottled water we sometimes reach for because it feels cleaner, purer, and safer is not necessarily giving us less plastic at all.
00:17:31.839 --> 00:17:37.039
I want to say that clearly because it matters and because it is so often left out.
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Scientists have become very good at finding these particles and very good at counting them.
00:17:42.799 --> 00:17:50.720
What they have not yet done is prove that the amounts we meet in ordinary life are actually making us ill.
00:17:50.960 --> 00:18:06.319
The World Health Organization looked carefully at microplastics in drinking water and concluded that on the evidence we have so far, there was no clear sign of a risk to health at the levels we typically encounter.
00:18:06.480 --> 00:18:11.119
While being honest, that the science is still young and incomplete.
00:18:11.279 --> 00:18:18.000
And more recently, food safety bodies in Europe and America have said much the same thing.
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The evidence so far is simply not strong enough to draw firm conclusions.
00:18:24.400 --> 00:18:33.759
And this is where I want to be a steady voice because this is a subject that pulls people to two extremes, and in my perspective, both of them are wrong.
00:18:34.000 --> 00:18:42.880
On one side, there are the frightening headlines that studies have reported microplastics in your blood, your brain, your mother's placenta.
00:18:43.119 --> 00:18:51.440
That is genuinely sobering, but detecting a material is not the same thing as demonstrating it is causing disease.
00:18:51.680 --> 00:18:58.960
On the other side, there are voices keen to reassure you that there is absolutely nothing to think about here at all.
00:18:59.200 --> 00:19:06.160
And the honest, grown-up truth sits quietly in the middle holding two ideas at the same time.
00:19:06.400 --> 00:19:13.680
The first idea is this we have not shown that these particles are harming us at the levels we meet in daily life.
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So there is no good reason to lie awake at night or to feel afraid of a glass of water.
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Fear that runs ahead of the evidence helps no one.
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But the second idea is just as important.
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Reports of man-made plastic particles turning up in human tissues, a material that essentially did not exist in our bodies a century ago is reason enough to pay attention and to want to understand it properly.
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Because absence of proof of harm is not the same thing as proof of safety.
00:19:48.640 --> 00:19:53.279
Those are two very different statements, and it would be a mistake to confuse them.
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A person can hold both of those thoughts together without collapsing into either panic or dismissal.
00:20:00.240 --> 00:20:07.519
And here is where our story comes full circle because there is a real echo of Jon Snow in all of this.
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In his day, the danger in the water was invisible too.
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People could see the deaths, but they could not yet prove how, because the science to understand it did not exist yet.
00:20:19.279 --> 00:20:23.200
They were living inside the question before anyone had the answer.
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We are standing in a strangely similar place with microplastics.
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We can now see the particles and count them, but we cannot yet fully read what they mean for us.
00:20:35.200 --> 00:20:43.119
That work is happening right now in laboratories all over the world, and it may be a few years before we truly know.
00:20:43.279 --> 00:20:49.759
And perhaps the most honest thing I can tell you is that this chapter has not been written yet.
00:20:49.920 --> 00:20:56.559
And in the meantime, well, I think we all know a few people who have declared war on plastic.
00:20:56.799 --> 00:21:08.720
The ones at war in the kitchen, guarding the glass jars, refusing to let the children near a plastic cup, plate or bottle, and yet their own phone sits wrapped in a plastic case.
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Half the bathroom is plastic bottles, shampoos, and lotions.
00:21:13.440 --> 00:21:21.599
The children's toys are almost entirely plastic, and the entire fridge is full of food wrapped in plastic.
00:21:21.839 --> 00:21:25.599
The war, it turns out, has very specific borders.
00:21:25.839 --> 00:21:31.519
I say all of this, of course, as someone whose own life is hardly plastic free.
00:21:31.759 --> 00:21:35.200
So take my perspective for what it is worth.
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And finally, where does all of this leave you standing in your kitchen holding a glass of water?
00:21:42.160 --> 00:21:48.720
Let me give you some very calm practical things so that a great deal of worry can safely be set down.
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First, and this is a big one if your tap water is already known to be safe, drink it.
00:21:56.079 --> 00:22:02.559
In most developed countries, such as the UK, your tap Water is held to good standards.
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It is tested again and again all the way to your kitchen.
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So the idea that bottled water is somehow purer or cleaner or better for you is mostly a feeling that has been sold to us, not a fact.
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And as we have seen, the plastic bottle may quietly be adding the very thing you were hoping to avoid.
00:22:24.240 --> 00:22:28.960
Second, if you do use plastic, keep it away from heat.
00:22:29.200 --> 00:22:36.880
A plastic bottle left in a hot car or in direct sunlight all afternoon will shed more particles into the water.
00:22:36.960 --> 00:22:39.920
And in the kitchen, this is the one I would underline.
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Use glass or ceramic rather than plastic containers when heating or microwaving food.
00:22:47.279 --> 00:22:53.519
It's a small, simple change if reducing your plastic exposure is something you want to do.
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Third, if you'd like to go a step further, a simple water filter can help.
00:22:58.880 --> 00:23:06.720
Some filters can reduce the microplastic particles in water, although how well they work depends on the type of filter.
00:23:06.880 --> 00:23:15.440
And honestly, for most people with a safe, regulated water supply, this is an optional extra rather than a necessity.
00:23:15.759 --> 00:23:18.240
A nice to have, not a must.
00:23:18.480 --> 00:23:24.319
And finally, one genuinely useful thing because knowledge is a quiet kind of power.
00:23:24.480 --> 00:23:30.240
If your tap water suddenly changes color, smell or taste, here is what to do.
00:23:30.559 --> 00:23:33.440
First, check another tap or two in your home.
00:23:33.599 --> 00:23:39.279
If it is only the one, the problem is probably your own plumbing, not the supply.
00:23:39.599 --> 00:23:48.880
Then, if you can ask a neighbor if their water is or two, that points to something in the wider network, not just your home.
00:23:49.039 --> 00:23:52.720
And that is exactly when you contact your water company.
00:23:52.960 --> 00:23:58.000
In most places, and certainly in the UK, every home is served by one.
00:23:58.160 --> 00:24:03.359
Their number is on your water bill, the internet, and they are obliged to investigate.
00:24:03.599 --> 00:24:08.240
And here is the reassuring part: the thing that ties back to Brixum.
00:24:08.400 --> 00:24:13.839
When Cryptosporidium caught into that supply, the contamination itself was a failure.
00:24:14.000 --> 00:24:15.680
We should be clear about that.
00:24:15.920 --> 00:24:19.440
But what happened around that failure matters too.
00:24:19.680 --> 00:24:27.920
The problem was quickly detected, people were warned, the supply was investigated, and ultimately the company was held to account.
00:24:28.240 --> 00:24:32.160
Safe water does not mean nothing can ever go wrong.
00:24:32.400 --> 00:24:37.119
It means we build systems designed to detect when it does.
00:24:37.359 --> 00:24:46.000
One last thing worth knowing: if you are ever curious, you can look up the water quality report for your own postcode, usually online.
00:24:46.319 --> 00:24:52.480
Your water company publishes it and it will tell you exactly what is in the water, where you live.
00:24:52.720 --> 00:24:59.519
Most of us never think to look, but it is there if you ever want the reassurance of seeing it for yourself.
00:24:59.759 --> 00:25:13.119
And if the taste is ever really strong, if it smells of fuel, solvents, or chemicals, or if a few people around you are falling unwell, please don't try to make it safe by boiling it.
00:25:13.359 --> 00:25:18.319
Stop using it for drinking and contact your water company immediately.
00:25:18.559 --> 00:25:27.599
That watchfulness, that testing again and again, all the way to your tap is the quiet machinery that keeps the water safe.
00:25:27.759 --> 00:25:32.559
It is Jon Snow's map still being drawn every single day.
00:25:32.880 --> 00:25:37.200
So here we are, back where we began with water.
00:25:37.359 --> 00:25:41.039
Something so ordinary that most of us barely notice it.
00:25:41.200 --> 00:25:45.920
We turn a tap, fill a glass, take a sip, and carry on with our day.
00:25:46.160 --> 00:25:50.880
And yet, behind that simple act lies a remarkable human story.
00:25:51.119 --> 00:26:11.759
The people who asked better questions, the people who were willing to change their minds, the engineers who built the sewers, the scientists who learned what to look for, and the thousands of people, even now, whose work allows the rest of us to turn a tap without giving any of it a second thought.
00:26:11.920 --> 00:26:22.079
I think about that scene Cornwall sometimes and the thing it seemed to teach me over and over again that each time the waves fall, they never fail to rise again.
00:26:22.319 --> 00:26:32.960
Perhaps water has been teaching us something all along to pay attention to what sustains us, to care for it, and every so often to begin again.
00:26:33.279 --> 00:26:40.240
I hope something today stirred a thought or simply made you look at the next glass of water in your hand a little differently.
00:26:40.559 --> 00:26:41.599
Thank you for listening.
00:26:41.759 --> 00:26:42.400
I'm Dr.
00:26:42.480 --> 00:26:42.880
Mohi.
00:26:43.359 --> 00:26:45.519
Until next time, remember this.
00:26:45.839 --> 00:26:50.880
Some of the things that sustain us are so familiar that we stop seeing them.
00:26:51.119 --> 00:26:57.839
And perhaps paying attention to them again is one small way of coming home to ourselves.
