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Vision by Man and Machine

How does an animal see? How might a computer do it? A study of stereo vision guides research on both these questions. Brain science suggests computer programs; the computer suggests what to look for in the brain

By Tomaso Poggio

The Tornado

This intense whirlwind has been one of the most elusive phenomena in meteorology. New observation techniques are now revealing how it is spawned by a thunderstorm and promise to uncover the flow inside

By John T. Snow

The Nesting Behavior of Dinosaurs

The discovery of large numbers of dinosaur eggs and skeletons of young dinosaurs at two sites in Montana has led to a novel interpretation of the social relations of these extinct reptiles

By John R. Horner

The Diamond-Anvil High-Pressure Cell

This ingenious device makes it possible to replicate the pressure near the core of the earth by turning a thumbscrew. Its widespread application has revolutionized the study of high-pressure phases

By A. Jayaraman

Prehistoric Rice Cultivation in Southeast Asia

Recent archaeological work in the region demonstrates that the domestication of the grain led to the rise of city-states and the development of trade contacts with India and China

By C. F. W. Higham

Molecular Clouds, Star Formation and Galactic Structure

Radio observations show that the giant clouds of molecules where stars are born are distributed in various ways in spiral galaxies, perhaps accounting for the variation in their optical appearance

By Nick Scoville and Judith S. Young

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