No other placental mammal that we know of prefers one side of the body so consistently, not even our closest primate relatives. But being right-handed may have deep evolutionary roots in our lineage. And yet, being a leftie does seem to come with some une...

Imagine an enormous, lush rainforest teeming with life...in the Arctic. Well, there was a time -- and not too long ago -- when the world warmed more than any human has ever seen. (So far)

At the beginning of the Triassic Period, with the continents locked together from pole-to-pole in the supercontinent of Pangea, the world is hot, flat, and very, very dry. But then 234 million years ago, the climate suddenly changed for the wetter.

The inside story of how Harvey Weinstein allegedly sexually harassed and abused dozens of women, and the elaborate ways he tried to silence his accusers. (Aired 2018). FRONTLINE’s documentary investigates the disgraced mogul’s spectacular downfall, and wh...