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  1. Earth

    Rogue alga routed

    An invasive-species action team has eradicated one of the world's worst weeds, a marine alga, from a California lagoon, its only known foothold in North America.

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  2. Health & Medicine

    The Screen Team

    New and experimental methods of screening for colorectal cancer that patients find less unpleasant than current tests could take a bite out of the malignancy's toll.

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  3. 19720

    I have a question concerning this article. It says, “As the sun rotates, its polar regions make a complete circle in about 34 days, compared with the 25 days required by its equator.” I was wondering how it’s possible to have two points on a rotating body take different amounts of time to make a […]

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  4. Astronomy

    The Sun’s Halo in 3-D

    A new computer map of the sun's outer atmosphere and spacecraft ready for launch are expected to shed new light on the origin of solar eruptions and provide more accurate warning of their impact on Earth.