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  1. Earth

    Sky High: Gamma-ray bursts are common in Earth’s upper atmosphere

    Enigmatic bursts of high-energy gamma rays produced Earth's atmosphere are stronger and more frequent than previously thought.

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  2. Hearing Repaired: Gene therapy restores guinea pigs’ hearing

    By turning on a gene that's normally active only during embryonic development, researchers have restored hearing in deaf guinea pigs.

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  3. Astronomy

    Images from the Edge

    Examining nearby reaches of the universe at ultraviolet wavelengths, a recently launched spacecraft has found regions of star birth in unexpected places.

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  4. Humans

    Letters from the February 19, 2005, issue of Science News

    Negative thinking The article “Sweet Glow: Nanotube sensor brightens path to glucose detection” (SN: 1/1/05, p.