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Science  04 Dec 1998:
Vol. 282, Issue 5395, pp. 1779
DOI: 10.1126/science.282.5395.1779b

Gene family trees. Need to find out how closely certain proteins or genes are related? Ship them off to Meta-MEME, a new program on the Web that searches protein and DNA sequence data for shared features and evolutionary relationships using a technique called “motif-based hidden Markov modeling.” metameme.sdsc.edu

Playing God with the solar system. Find out at the Astronomy Workshop how big a crater you'd create if you hurled a kilometer-wide chunk of ice at the moon or Mars. Other programs let you tinker with planet orbitals, see how gravity affects an asteroid's orbit, and more. janus.astro.umd.edu

Quasi-perfect. Just 16 years ago, chemists discovered “quasi-crystals,” a kind of crystal—often alloys containing aluminum—that doesn't have a perfect repeating pattern. You'll find a tutorial and links to review articles, software, and research groups at www.nirim.go.jp/∼weber/qc.html

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