London, 1849, you are a doctor and the dreaded disease, Cholera, is literally hitting the city the like the Bubonic plague. Your neighbor was fighting fit on Monday, and Wednesday morning you watched him go out on the corpse cart. The epidemic will go on to take over 50,000 lives before petering out a few months later. But based on its track record, you know it will be back. What do you do? If you’re John Snow, anesthesiologist and part-time medical investigator, you march through […]