Watch Clip
A History of Vaccination
4m 48s
/ TV-PG
Vaccination began as a traditional therapy over a thousand years ago.
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Video description: A spectacular fossil graveyard reveals a 43-million-year-old whale that had four legs and could walk. Follow scientists as they search for new clues to how mammals moved from land into the sea to become the largest animals on Earth.
Science shows it’s a small world after all—and nature’s networks follow a similar pattern.
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