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!
It's one of the biggest puzzles of paleontology: Why did North America's large mammals go extinct shortly after the glaciers melted about 15k years ago? New study suggests that hunters get the credit -- or blame. ...more
Flu vaccine is made in eggs, but that's too slow for a major epidemic. How are vaccines made inside animal cells? What other methods can protect us against a fast-changing, deadly virus? ...more
Hole was about as big as North America in September, scientists report. Read about ozone and the other "planetary limits." ...more
Take a peek into the brain of a mass murderer. ...more
Darwin's book rocked biology -- and society. Read the latest evidence for evolution. ...more