Table of Contents March 1997

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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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Some 600 million years ago, a bizarre group of creatures arose. They had no heads, no tails, no eyes or mouths. They looked like nothing else that has since lived on earth. They were long thought to have been an evolutionary dead end. They may have been our ancestors.
Einstein said a spinning planet should twist space-time. After 40 years of planning and half a billion dollars, the test is about to begin.
By all rights, life in the sea should leave a dolphin baked, crushed, and sterile. This graceful mammal avoids such a fate only by slipping through loopholes in the laws of physiology.
It takes more than just a hormone to make a fellow's trigger fish itch.
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