30 to 21
Ocean Plant Life Feels the Heat
: The ocean's vital phytoplankton are in the midst of a long decline.
"Ardi" Continues to Shake the Human Family Tree
: This fossil female created a huge stir when discovered, but some scientists question its significance to human evolution.
The Incredible Shrinking Moon
: Researchers find signs of a lunar lessening.
Egg Recall Rattles the Food Supply
: After 500 million eggs are recalled, what happens next?
How Matter Defeated Antimatter
(pictured): The Tevatron particle smasher offers hints on the universe's beneficial bias towards matter.
Interview with Steven Chu
: Our Secretary of Energy speaks up on getting to a green-energy future.
Space Ship Sails on a Breeze of Sunshine
: The first journey of a solar sail spacecraft is a success!
Comets Are Interstellar Visitors
: The solar system's Oort cloud, where comets are born, may be full of immigrants from other stars.
Hair DNA Documents a Forgotten Migration
: You can learn a lot from 4,000-year-old hair.
MRI Scans Track Brain Development
: In six minutes, a scan can reveal if a child's brain is developing normally.