Table of Contents September 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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Most female mammals are anything but subtle when it comes to telling males it's time for sex. Not humans. For good evolutionary reasons, women have found it's much better to keep men in the dark.
Why do so many of us suffer from useless allergies? The answers may lie in our body's efforts to protect us from unseen invasions by worms.
Scientists take their information from wherever they find it--even from a craggy brown edifice of excrement.
Extinction comes to species on land and in the sea but not in the same way. As the tales of some remarkable creatures from many millions of years ago show who goes first is a matter of ecology.
In the mysterious new world of molecular architecture, you absolutely cannot be too thin.