Aliens attacking Earth -- it's the stuff of sci-fi stories, but what if it really happened? Host Michelle Rodriguez (Avatar, Battle: LA) brings together top scientists and military strategists to dramatize what would happen if and when aliens attack.

Orgasm - one of the most intense pleasures. But what are orgasms actually for? In men, the answer's simple- reproduction. But women don't need an orgasm to get pregnant. With cutting edge science, Maggie Gyllenhaal hosts a revealing investigation.

It's almost 100 years since the Titanic sank. We think we know the story but how much do we actually know? Drawing on detailed trial records that describe the sinking, we recreate both the science and human drama of one of history's greatest stories.

Everything which has made America bountiful and powerful is a product of forces which date back billions of years. How have earth's ancient forces made America what it is today?

The Mayans predict that time will end on December 21, 2012. But how likely is a global apocalypse from a scientific point of view? When, where and will it happen, if at all? Samuel L. Jackson hosts this CGI spectacular.

Were we better off as cavemen? Morgan Spurlock ("Super Size Me") joins nine ordinary men and women in an attempt to survive in the wild using only stone-age technology. Cold, dehydration, and hunger threaten to derail the experiment from the start.