Arianna Huffington in Support of Sleep, Waking Up to the Devastation of Climate Change in Josh Fox's New Film

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Arianna Huffington investigates the national sleep deprivation epidemic.

Arianna Huffington investigates the nationwide sleep deprivation epidemic in her new book, "The Sleep Revolution." Josh Fox, director of “Gasland,” on his new film, “How to Let Go of the World and Love All the Things That Climate Can’t Change.” Brian Christian reveals how the logic of computer science and algorithms can be used to answer questions about life. Reporter Matthew Cole from The Intercept discuss the investigation that exposed former Blackwater CEO Erik Prince and his plan to build a private air force.