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ESSAYS & COMMENT
Ground Swell on Wheels
Appropriate technology could bring sturdy wheelchairs to 20 million people
RALF D. HOTCHKISS
FEATURES
Venus Unveiled
Has the Magellan spacecraft detected plate tectonics on the earth's twin?
DAVID HARRY GRINSPOON
Cichlids in Love
What a fish's social caste tells the fish's brain about sex
RUSSELL D. FERNALD
The Malignant Connection
When its molecular "nervous system" goes awry, a cell can turn cancerous
STEVEN L. PELECH
REVIEWS
Cover Story • Separated by Birth
A segregationist built a famous science museum on fears of racial "mixing"
TIMOTHY LENOIR
DEPARTMENTS
Initial Conditions • Editor's Notebook
Peer Review
Letters from Readers
Quanta
Recent Sightings
THE INFORMATION AGE
The Discovery of Debugging
Books in Brief • Reasoning with Maybe
Strange Matter
The Shadowy World of Math Videos
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