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"Alien" Atmosphere Helped Unfreeze Early Earth
WEEK IN PHOTOS: Chinese Mummy, Bloodletting Rite, More
Photograph courtesy NASA/JPL/Space Science Institute
Saturn is the only planet in our solar system that is less dense than water. If you could build an imaginary gigantic bathtub, Saturn would float in it. --NASA
The economy may slow to a crawl in 2009, but science won't stop. We asked a panel of experts what surprises the coming year may hold.
Robots became more human-like in the past year, which saw the debuts of "emotional" robots, robot bartenders, robot swarms, and more.
Download unforgettable photos of landscapes, space exploration, the human body, and more.
Watch incredible videos about Earth science, space exploration and the solar system, health and the human body, the prehistoric world, and much more.
See who won this year’s grand prize trip to the Grand Canyon!
Enter for a chance to win a trip for two to the Four Worlds of Ecuador.
Trace your ancestry back over 60,000 years, as written in your genes.
Get tips for helping the environment.
Discover the extraordinary impact that an average human life has on the world.
Play games, watch videos, and much more in this just-for-kids site.