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April 16, 2012 08:34 pm PDT

Why we still don't totally understand how diseases spread

When I was little, I read a Reader's Digest book of great disasters, which included a segment on the Black Death. One of the things the book tried to do was explain, on a child's level, why it wasn't easy to figure out that rats and fleas were the source of the plague. You couldn't [...]


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