Geology

Clay...the next topical penicillin?

Clay has been associated with home cures since Roman times. But there have been very few scientific studies to investigate such claims--until now. Researchers at ASU have found that French green clay can kill pathogenic bacteria. --by Margaret Coulombe

Saguaro's end

The flesh of a rotting saguaro cactus is 90 percent water, a moist organic soup that is teeming with life. The whole thing is moving, heaving with bugs, worms, and all sorts of microorganisms. It also sparkles with a stunning variety of crystals--some rare, some completely new to science. --by Adelheid Fischer

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