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  1. Earth

    Killer Cocktails: Drug mixes threaten aquatic ecosystems

    Trace amounts of pharmaceutical drugs in waterways may work together to deform and kill native microscopic organisms.

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  2. Not a Turn-On: Alleged X chromosome activator may be a dud

    A gene that helps regulate X chromosome activity in mice doesn't work in people.

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  3. Materials Science

    Spinning Fine Threads: Silkworms coerced to make better silk

    The caterpillars that spin commercial silk can make tougher or more elastic threads, depending on how fast they're forced to spin.

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  4. Ecosystems

    Tougher Weeds? Borrowed gene helps wild sunflower

    Feeding concerns about developing superweeds, a test of sunflowers shows for the first time that a biologically engineered gene moving from a crop can give an advantage to wild relatives under naturalistic conditions.