Table of Contents September 1996

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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Industrial chemicals can mimick natural hormones and wreak havoc in developing animals.
In 1908 hundreds of square miles of Siberian forest were flattened and burned by a mysterious fireball. Only now, nearly nine decades later, are we learning what really happened--and not a minute too soon.
Can't tell a Chateau Margaux '82 from an '84? Can't stop worrying whether you turned off the gas? Get a new nose. On a chip.
Half a billion years ago, a large chunk of North America went missing. That chunk has now turned up in the Andes of Argentina.
In the fierce evolutionary battle to pass on one's genes, says one controversial hypothesis, everyone else is a potential competitor--even the infants.