Charles Darwin and the Tree of Life

Discover the evolutionary secrets of some of the world’s most majestic creatures. From voracious crocodiles and acrobatic birds to stupendous...

When Harvard PhD student Jennifer Brea is struck down at 28 by a fever that leaves her bedridden, doctors tell her it’s "all in her head."...

A documentary on Al Gore's campaign to make the issue of global warming a recognized problem worldwide.

Trees talk, know family ties and care for their young? Is this too fantastic to be true? German forester Peter Wohlleben and scientist Suzanne Simard...

Although first glance reveals little more than stones and sand, the desert is alive. Witness moving rocks, spitting mud pots, gorgeous flowers and...

Commentator-comic Bill Maher plays devil's advocate with religion as he talks to believers about their faith. Traveling around the world, Maher...

A breathtaking adventure across five continents and through time to reveal nature's most vital secret. Watch a flying fox gorge itself on a midnight...

In 1858 Charles Darwin struggles to publish one of the most controversial scientific theories ever conceived, while he and his wife Emma confront...

William Shatner presents a light-hearted look at how the "Star Trek" TV series have influenced and inspired today's technologies, including: cell...

Documentary footage from various sources, set to music. Showing the whole of human life, from birth to death and beyond.

A scientist explains how the savagery and efficiency of the insect world could result in their taking over the world.

The use of embryonic stem cells has ignited fierce debate across the spiritual and political spectrum. But what if we could create manmade stem cells...