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Science  15 Oct 1999:
Vol. 286, Issue 5439, pp. 371
DOI: 10.1126/science.286.5439.371c

Billions and billions served. If you've ever wondered how the world's health and environment are bearing up under the weight of 6 billion people—a milestone expected to be passed this week—check out this site. It features links to United Nations reports, news articles, and other Web resources, such as a snazzy interactive site in France called Popexpo. www.cnie.org/billion

Red light. The hunt for planets outside our solar system is no longer the sole province of the pros. Amateur astronomers who've mounted CCD (charge-coupled device) cameras on their telescopes have begun to collect radial velocity measurements (redshifts), in the hope of finding extrasolar planets. Follow the progress of a team led by a paintball gun manufacturer, or find links to others. http://www.spectrashift.com/

Brain food. It's called Neuroscience for Kids, but this sprawling site has fun and useful stuff for any age. You'll find loads of factoids (like brain weights of different species), a Q&A file (what's the most sensitive body part? the face), and links to online articles on topics from musical aptitude to narcolepsy. faculty.washington.edu/chudler/neurok.html

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