Table of Contents October 1993

Discover Magazine's mission is to enable readers to lead richer lives by explaining and expanding their universe.  Each month we bring you in depth information and analysis from various topics ranging from technology and space to the living world we live in.
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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.
How we understand life's past is more a consequence of art than of science.
The quaking aspen, one of this country's most beautiful trees, also makes up the world's most massive organism.
Why do mountains kill some people--or make them so ill they may wish they were dead--while leaving others quite unscathed?
If black holes evaporate like snowballs in the sun, then the past is forever severed from the present.