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Why a falling pole can be held up: feedback, and the PID controller A pole on a cart wants to fall, and a controller that watches the lean and shoves the cart can hold it up. But how hard it pushes matters: too weak and it… Engineering4 min read How a map of dots found a cholera pump in 1854: John Snow and Broad Street In late August 1854, cholera tore through a few streets of Soho, killing roughly 600 people in weeks. Almost everyone blamed foul air. John Snow suspected the… History4 min read How one doctor's map traced a cholera outbreak to a single pump In 1854 most doctors blamed cholera on bad air. When it tore through Soho, killing hundreds in days, John Snow went door to door asking one question: where did… History5 min read