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Anti-vaccination crowd spreads non-truths
Chris Hayes talks with Seth Mnookin, author of the book "The Panic Virus: A True Story of Medicine, Science, and Fear" and NYU Professor Arthur Caplan about the anti-vaccination crowd's impact on vaccination culture.
The inexplicable weirdness of Rick Scott04:31
Bad news for some blue state GOP governors05:30
Leaks from the Mike Brown investigation surface07:27
Amazing video of Ottawa post office evacuation01:35
Who was the Ottawa gunman?07:38
Shooting attack in Ottawa stuns Canada16:11