As the Planet Warms, What Happens to the Reindeer?
Ecologists are racing across the ice to find out how climate change will affect the Arctic natives
Why Are Some Feathers Blue?
New research into a long-puzzling feature of avian life shows there's more to color than meets the eye
Probing a 68-million-year-old T. rex, Mary Schweitzer stumbled upon astonishing signs of life that may radically change our view of the ancient beasts
Invasion of the Snakeheads
The voracious "Frankenfish" has turned up in the Potomac River, Lake Michigan and a California lake, sparking fears of an ecological Armageddon