Table of Contents November 1992

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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It remains one of biology's deepest enigmas. How does an egg, a tiny squishy blob of a cell, grow into a fully formed organism--a sinuous worm, a delicate fly, a perfect human baby?
There's no doubt that we are smart enough to conquer many diseases. But like it or not, we are also part of the process that produces them.
From ice age to hothouse, Earth seems to change its temperature by adjusting its blanket of CO2.
Our urge to go forth and multiply could, a century and a half from now, leave earth with more than 694 billion people--some 125 times our current populations.
The short answer: astronomers don't know which is why some of them are abandoning their old step-by-step approach and are trying to take the measure of the cosmos in one fell swoop.
Defining it is hard enough--giving it to a computer is even harder.
Chaos surrounds us, and yet so do orderly patterns. Scientists are now trying to discover how they can coexist.
Surely, out of the countless spheres in the universe, one harbors something that can say hello.
Earth could have been just another empty chunk of rock. But something happened here, and it may have taken place on a stage of clay.
Prehistorians really agree that all of us originally came out of Africa. It's the details that cause a paleoanthropological donnybrook.