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Dig into the science and superstition behind the myth of vampires, and how it has persisted from ancient Mesopotamia to today.--The myth of the bloodsucking vampire has stalked humans from ancient Mesopotamia to 18th-century Eastern Europe, but it has differed in the terrifying details. So, how di‮…
View full lesson: http://ed.ted.com/lessons/human-sperm-vs-the-sperm-whale-aatish-bhatiaTraveling is extremely arduous for microscopic sperm -- think of a human trying to swim in a pool made of...other humans. We can compare the journey of a sperm to that of a sperm whale by calculating the Reynol‮…
Trace the 7,000 year old history of alcohol, from its first known origins in China to cultures all over the world fermenting their own drinks.--Nobody knows exactly when humans began to create fermented beverages. The earliest known evidence comes from 7,000 BCE in China, where residue in clay pot‮…
Uncover the rich history of illuminated manuscripts and the often bizarre images that filled the margins of medieval books.--A rabbit attempts to play a church organ, while a knight fights a giant snail and a naked man blows a trumpet with his rear end. These bizarre images, painted with squirrel-‮…
Each kind of light has a unique wavelength, but human eyes can only perceive a tiny slice of the full spectrum -- the very narrow range from red to violet. Microwaves, radio waves, x-rays and more are hiding, invisible, just beyond our perception. Here is a closer look at the waves we can't see. A‮…
הצהרה: הפודקאסט והגרפיקה המוטבעים בדף זה הם מ-TED-Ed, שהוא רכושו של בעליו ואינו קשור או מאושר על ידי Listen Notes, Inc.