John Snow is often called the founder of epidemiology, the study of health in populations. He is best known for his work on tracking the spread of cholera during an epidemic in London in 1854.

At the beginning of the 19th century, bad sanitation, overcrowding and really rubbish medical services meant that public health was pretty terrible. But a couple of top blokes called Edwin ...

John Snow started mapping incidences of the disease in Soho, and noticed clusters around the Broad Street water pump. Snow disabled the pump (a recently restored replica of which stands outside ...