SEPTEMBER 22, 2019 John Snow isn’t just a famous character from HBO’s “Game of Thrones.” He was a real person, an MD in fact, living in London, England in the mid-1850s. And we all owe him a good deal of gratitude, because without him, there’s no telling how many more of our ancestors would have succumbed to cholera. In 1854, an outbreak of cholera hit the neighborhood streets of London. The running theory of the day was that miasma, meaning bad air, was the source of these outbreaks. John Snow worked to refute this idea. He believed contaminated water was to blame. He proceeded to map out the infected individuals and proposed a hypothesis that the public water pump on Broad Street was the commonality. John Snow Water Pump, Source: CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=357998 I had plans to visit the pump on my recent trip to London, pictured above, which features a plaque in dedication to Snow. Unfortunately jet lag got the best of me and instead, I staye...