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Science  26 Feb 1999:
Vol. 283, Issue 5406, pp. 1223
DOI: 10.1126/science.283.5406.1223d

Uncertain history. The uncertainty principle, which says you can't know an electron's precise position and momentum at the same time, is one focus of this new online exhibit on Werner Heisenberg. It describes the German physicist's early quantum mechanics work, his involvement in Nazi fission research, and his role in reviving post-war German science.

Full-course load. Whether you're a student brushing up on solid state physics or a professor planning an environmental science course, the World Lecture Hall may help. Hundreds of professors have posted links to their online course material, from archaeology to genetics and rainforest research.

Drug store. Wondering what Demerol looks like, or how lithium helps control mania? This site lists practically every class of drugs you can think of, shows the drugs' chemical structure, and briefly describes their biochemistry.

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