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Science  03 Dec 1999:
Vol. 286, Issue 5446, pp. 1811
DOI: 10.1126/science.286.5446.1811c

Pebbles going bam-bam. Surprised by the weak gravity exerted by some seemingly hefty asteroids, astronomers have come to suspect that these are not solid chunks but piles of little rocks that whiz through space en masse. But how might these clumps crash together to form large bodies—or collide and spin off smaller assemblages of rocks? Find out at this site featuring cool movies of rubble pile collisions.

Microbe tacticians. Infectious disease experts will swap war stories during the Howard Hughes Medical Institute's holiday lectures, “2000 and Beyond: Confronting the Microbe Menace,” to be broadcast on the Web on 6 and 7 December. Don't miss the site's nifty graphics: You can dissect a leech in a virtual lab, for instance, or see animations of Salmonella and Escherichia coli bacteria invading the cells lining the gut.

Protein web. Pour yourself a little Java with your proteins using WebMol, a free program for online viewing of macromolecular structures in the Protein Data Bank. Includes many options for analyzing structure.∼walther/webmol.html

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