Table of Contents September 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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Scientists have a wildly ambitious plan to transform the fourth planet from the sun into an exact duplicate of the third.
To get to the bottom of schizophrenia, two scientific rivals are seeking help from some unusual twins--twins who are identical in all respects but one.
A neuropathologist defies conventional wisdom when he swears there's a connection between aluminum and Alzheimer's.
By tracking changes in ancient atoms, archeologists are establishing the astonishing antiquity of modern humanity.