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    Former friend of Amber Heard becomes emotional after seeing images of Heard's injuries

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NBC News

From smallpox to the coronavirus: The history of vaccinations explained

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Dr. Josefa Steinhauer explains the history of the first human vaccine and the early days of the anti-vaxx movement.April 1, 2020

  • UP NEXT

    Former friend of Amber Heard becomes emotional after seeing images of Heard's injuries

    01:41

  • Ukraine's first war crimes trial against Russian soldier begins

    00:54

  • Watch: Australian prime minister accidentally tackles child to ground in soccer game

    00:46

  • Kim slams North Korea's Covid response as 'immature'

    00:47

  • McCormick, Oz in close race for Pennsylvania GOP Senate pick

    01:16

  • Finland, Sweden submit formal applications to join NATO

    00:49

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