A history of the U.S. manned space program post Apollo, as seen by Mission Control.

Beyond the Moon: Failure Is Not an Option 2

Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles. What explains this explosion of living creatures—1.4 million different species discovered so far, with perhaps another 50 million to go? The source of life's endless forms was a profound mystery until Charles Darwin brought forth his revolutionary idea of natural selection. But Darwin's radical insights raised as many questions as they answered. What actually drives evolution and turns one species into another? To what degree do different animals rely on the same genetic toolkit? And how did we evolve?

What Darwin Never Knew

As the 100th anniversary of Titanic's sinking approaches, a team of scientists, engineers, archaeologists and imaging experts have joined forces to answer one of the most haunting questions surrounding the legendary disaster: Just how did the "unsinkable" ship break apart and plunge into the icy waters of the North Atlantic? Written by History Channel