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The Small Planets

Asteroids have become notorious as celestial menaces but are best appreciated in a positive light, as surreal worlds bearing testimony to the origin of the planets

By Erik Asphaug

Making Metallic Hydrogen

By re-creating extreme conditions like those in Jupiter's core, physicists have at long last turned hydrogen into a metal

By William J. Nellis

Care for a Dying Continent

In Zimbabwe--where AIDS is prematurely killing a generation of adults--counselors and researchers struggle against social customs, viral resourcefulness and despair.

By Carol Ezzell

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