Science  15 Jan 1999:
Vol. 283, Issue 5400, pp. 295d
DOI: 10.1126/science.283.5400.295d

Supplemental data. Hoping to cut through the hype about melatonin, echinacea, and other health remedies, two federal agencies have set up a scientific citations database on dietary supplements. The site debuts this month with 250,000 records.

Laser vision. Bell Labs celebrates the 40th birthday of the laser, invented there in 1958, with this site describing the device's history and how it works.

Psych online. Get a feel for theories of cognition and perception at the Internet Psychology Lab. The site's interactive demos, accompanied by explanations, range from optical illusions to the tritone paradox (an auditory illusion) and the Stroop effect.

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