The Mapmaker's Ghost

In 1928, Alexander Fleming came back from vacation to find a ruined petri dish — and almost threw it away. What stopped him, and what he saw in that contaminated culture, would eventually save an estimated 200 million lives, but the path from a cluttered London lab bench to a working antibiotic inv…

In 1952, a chemist named Rosalind Franklin aimed an X-ray beam at a fiber of DNA and captured an image that would quietly rewrite biology — without her permission, without her knowledge, and ultimately without her name on the prize. This episode reconstructs the four-way race to decode the double h…

Alexander Fleming gets the credit. But the real story of penicillin is a decade of neglect, a wartime deadline, and a rotating cast of forgotten chemists racing to turn a laboratory curiosity into the drug that changed what it meant to survive. This week, we trace the distance between 'discovered' …

In 1908, a woman with no formal physics degree was cataloguing stars in a Harvard basement when she noticed something that would shatter our understanding of how big the universe actually is — and then watched a man take credit for it. This episode traces how Henrietta Swan Leavitt's discovery of t…