THIS DAY IN SCIENCE: Autumnal Equinox in 2015

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How do vaccines work? – TED-Ed

How do vaccines work? – TED-Ed

The first ever vaccine was created when Edward Jenner, an English physician and scientist, successfully injected small amounts of a cowpox virus into a young boy to protect him from the related (and deadly) smallpox virus. But how does this seemingly counterintuitive...
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