Is the weather on Mars anything like the weather on Earth? Find out in this video.

On February 1, 2003, the space shuttle Columbia disintegrated just 16 minutes before it was due to land. All seven astronauts aboard perished, and the implications for the future of the space shuttle program were enormous. Through interviews with astronauts and their families, and with members of the Columbia Accident Investigation Board, take a look at the Columbia tragedy — and at NASA itself.

Tom and Ray test out the waters of Iceland's Blue Lagoon while filming "Car of the Future."

A researcher tests the cognitive skills of a chimpanzee with a seemingly simple task.

Primatologist Brian Hare sees whether a bonobo can solve a puzzle to get a slice of apple.

Black chemist Percy Julian met with every possible barrier in a deeply segregated America. Here's how he rose to the highest levels of scientific and personal achievement.

Watch visualizations of ideas that helped Einstein devise his theories of relativity and of the equivalence principle.