Testosterone Rules
It takes more than just a hormone to make a fellow's trigger fish itch.
by Robert Sapolsky
When Life Was Odd
Some 600 million years ago, a bizarre group of creatures arose. They had no heads, no tails, no eyes or mouths. They looked like nothing else that has since lived on earth. They were long thought to have been an evolutionary dead end. They may have been our ancestors.
The Gravity Probe
Einstein said a spinning planet should twist space-time. After 40 years of planning and half a billion dollars, the test is about to begin.
The Dolphin Strategy
By all rights, life in the sea should leave a dolphin baked, crushed, and sterile. This graceful mammal avoids such a fate only by slipping through loopholes in the laws of physiology.