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  1. Humans

    Letters from the December 3, 2005, issue of Science News

    Eye on energy “Cosmic Ray Font: Supernova remnants rev up ions” (SN: 10/1/05, p. 213) is unfortunately murky. It’s confusing to state that accelerating charged particles to high speeds “therefore” produces cosmic rays. And what “charged particles”? Is the “energized” gas in fact “ionized”? “Energized” is too general a word. Finally, why are high-speed particles […]

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  2. Humans

    From the November 30, 1935, issue

    A giant salt container, slimming down overweight children, and taking isotopes for a spin.

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  3. Physics

    Shadows of Reality

    If you’re curious about different ways of viewing the fourth dimension, this Web site provides some intriguing glimpses of this strange realm.