During a televised news conference on Monday night, President Trump repeatedly gave out unproven medical advice that linked autism to Tylenol and childhood vaccines.Azeen Ghorayshi, a science reporter for The New York Times, explains what Mr. Trump said and what decades of scientific research actually tells us.Guest: Azeen Ghorayshi, a science reporter for The New York Times.Background reading: 

• Mr. Trump issued a warning based on an unproven link between Tylenol and autism.
• What to know about painkillers, vaccines, genes and autism.

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