This Week: Death of the mastadon
In the News: Antarctic ozone hole: 10th largest on record!
Coming Thursday: Return of the wild: Coyotes, bears and turkeys are back!
Scientists learn to make human embryonic stem cells without using eggs, embryos, or legal hassles. Adding four genes to skin cells did the trick.
Computer graphics and microbiology unite as scientists build complex digital models of cellular machinery to view a microscopic world in powerful new ways.