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The Case for Electric Vehicles

New technological developments have put practical electric cars within reach, but politics may slow the shift away from internal-combustion engines

By Daniel Sperling

Rock Art in Southern Africa

Paintings and engravings made by ancestors of the San peoples encode the history and culture of a society thousands of years old

By Anne Solomon

Quantum Seeing in the Dark

Quantum optics demonstrates the existence of interaction-free measurements: the detection of objects without light—or anything else —ever hitting them

By Paul Kwiat, Harald Weinfurter and Anton Zeilinger

Immunity and the Invertebrates

The fabulously complex immune systems of humans and other mammals evolved over hundreds of millions of years -- in sometimes surprising ways

By Gregory Beck and Gail S. Habicht

Global Climatic Change on Mars

Today a frozen world, Mars at one time; may have had more temperate conditions, with flowing rivers, thawing seas, melting glaciers and, perhaps, abundant life

By Jeffrey S. Kargel and Robert G. Strom


A new model of this reading disorder emphasizes defects in the language-processing rather than the visual system. It explains why some very smart people have trouble learning to read

By Sally E. Shaywitz

Can China Feed Itself?

Some surprisingly reasonable policy changes would enable the world's largest nation to produce more food for its 1.2 billion citizens

By Roy L. Prosterman, Tim Hanstad and Li Ping


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