Table of Contents June 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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The world's first large-scale AIDS vaccine trial will soon begin in Thailand.
Tough as steel, sturdier than concrete, full-size in a year.
Our brains are much like those of our primate cousins, so where did we get our uniquely human gift of speech? One human says we simply rewired brain structures devoted to a different, more general primate specialty--vision.
Their fossilized poop shows what they ate.
Each summer a herd of scientists races north, enduring white nights and relentless mosquitoes to study one of the world's harshest ecosystems.