During my time in London I worked in Soho, and from time to time I would pass a small black pump thingy on the sidewalk without giving it a second thought. Then one day I read the plaque on it. It turns out it was the focus of infection in the 1854 Cholera outbreak. Builder peggyjdb recreates this pivotal moment in disease control in his usual informative and brilliant style. Ah to be a Londoner in the 1800's.