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How a Young Boy, a Cow and a Milkmaid Helped to Conquer Smallpox [Video]

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If you aren’t familiar with the TEDEd series of animated videos, you should be. The series pairs professional educators with top-notch animators to create short video “lessons” on a huge variety of topics in science, medicine and history.
 The latest episode features several of the early attempts to fight smallpox, a disease caused by a [...]

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