Why have some conspiracy theories been pushed back into the public? Because when you try to force them out of the mainstream, they'll find a wider audience on the fringes.
A classic law of Internet debate explains why bringing up Hitler is a terrible idea as White House Press Secretary Sean Spicer found out in a disastrous press conference.
The times in history when science was deadly and dangerous.
Nobel Laureate and Columbia professor Dr Eric Kandel discusses the nature of good and evil via the Trump candidacy, and his own devastating childhood experiences in Austria.