Dr John Snow and cholera

A task to get students to re-enact (sort of!) what Dr John Snow did in terms of identifying the causes of an outbreak of cholera in london.
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\nfinding the real cause - story of Snow
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\nfinding the real cause graph - a gridded version of the map of London where Snow did his work
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\nfinding the real cause graph data - points to plot on the graph showing the water pumps and the cases (fictional) of cholera
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\nstudents then have to assess their graph and decide what it tells them and then what they shoudl do next