The Ultimate Vanishing
If black holes evaporate like snowballs in the sun, then the past is forever severed from the present.
The High Life
Why do mountains kill some people--or make them so ill they may wish they were dead--while leaving others quite unscathed?
The Trembling Giant
The quaking aspen, one of this country's most beautiful trees, also makes up the world's most massive organism.
Dinosaur Deconstruction
How we understand life's past is more a consequence of art than of science.
Coming to America
When did humans arrive here? Was it the long-accepted date of 11,200 years ago, or 10,000 years earlier? A remarkably detailed site in Chile may finally give us the answer.
