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Crash Course Biology: Biology (2012)

1x32 Your Immune System: Natural Born Killer

  • 2012-09-03T21:00:00Z on YouTube
  • 15m
  • United States
  • English
  • Documentary
Hank tells us about the team of deadly ninja assassins that is tasked with protecting our bodies from all the bad guys that want to kill us - also known as our immune system.
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