This landmark American tree is poised to return to eastern woodlands.
China is planting an enormous swath of forest to keep dust storms at bay.
Biologists learn why some HIV-positive people stay healthy for decades.
For marine life, climate change means more than warming.
An experiment uncovers a major killer of this popular sport fish in San Francisco Bay.
Stone Age "family values" reached to the afterlife.
Genetic details help sort out the bear family tree.
Genomics are getting personal.
The federal government is protecting a small group of Alaskan beluga whales before it gets any smaller.
Ancient bones found in caves are yielding genetic clues about Ice Age life.