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Science  27 Aug 1999:
Vol. 285, Issue 5432, pp. 1323
DOI: 10.1126/science.285.5432.1323b

Dark secret. One of the cosmos's most intriguing phenomena is the focus of The Truth About Black Holes, the latest lesson at the Space Telescope Science Institute's education page. Illustrated with cool graphics and Hubble images, it answers questions such as, “Is a black hole really a hole?” and “How many kinds are there?”

MEDLINE robot. Want some help keeping up on the latest biomedical journal articles in your field? Fill in a form at this free site, and it will search MEDLINE each week for your key words and e-mail you the results.

Water, water everywhere … Keep tabs on the drought that's choking the eastern United States—or the floods last month in Las Vegas—at this U.S. Geological Survey (USGS) site, which features maps showing stream gage readings from 3000 sites color-coded to show high or low readings. You can also pull up actual streamflow data from decades or hours ago, USGS news bulletins, maps of acid rainfall, and other water info.

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