This eye-opening documentary tracks the perilous path our planet took in its early years. It asks: How did Earth become a living planet?

She was a star whose rise was perfectly staged by the men who controlled her. But now we can understand how Norma Jeane Baker became Marilyn Monroe.

See why some scientists think Atlantis was buried under sand instead of water.

We follow a young cheetah mother and her cubs as she tries to transform them from adorable kittens into bold, powerful hunters.

Evil can appear in anyone, even in mothers. Witness accounts of sadistic moms told by the children who endured years of emotional and physical abuse.

Explore the adaptations and strategies that let African species survive.

Switzerland is something really special: majestic mountains, lush valleys, craggy rock landscapes, and Mediterranean lakes all in one small location.

An expert portrait of six men: Alexander the Great, Julius Caesar, Horatio Nelson, Napoleon Bonaparte, Ulysses S. Grant, and Georgi Zhukov.

This eye-opening documentary tracks the perilous path our planet took in its early years. It asks: How did Earth become a living planet?