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Greenhouse Gases and Climate Change

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(November 2000) Most of the sun’s radiation passes through Earth’s atmosphere to warm the planet. Earth’s surface in turn reflects this energy back toward space in the form of infrared (heat) radiation.

Sources of Voting Data

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(October 2000) An ancient Indian fable tells of six blind men who, one by one, touch an elephant, surmise what it looks like based on what they feel, and come up with six different “big pictures,” none resembling an elephant.

Youth and the HIV/AIDS Crisis

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(August 2000) About half of all people infected with HIV are under age 25, according to World Health Organization estimates, and in less developed countries, up to 60 percent of all new infections are among 15-to-24-year-olds.