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Maps show spatial relationships between different things. For example a map showing penguins and polar bears would make it very clear that they live far apart. A map showing lions and zebra would show them close together, with the lions trying to get as near as possible to the zebra. One famous map showed outbreaks of cholera in London and the location of public water pumps. It was instantly clear to everyone that the disease was coming from a polluted pump.

Similarly, the famous inventor Thomas Alva Edison used a map to show where German U-boats were lying in wait for merchant ships. No-one had shown that before on a map. Now the Navy knew where to hunt for the submarines. Strange but true.

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15y ago

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