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  1. Earth

    Cleaning up pollution, whey down deep

    Lab and field tests hint that dairy whey, a lactose-rich by-product of the dairy industry, could be used to clean up underground water supplies tainted by the solvent trichloroethylene.

    By Sid Perkins
  2. Earth

    Subglacial lakes may not be isolated ecosystems

    Large volumes of water may occasionally flow between the lakes that lie deep beneath Antarctica's kilometers-thick ice sheet.

    By Sid Perkins
  3. Health & Medicine

    Inactivity, not altitude, is probably behind blood clots

    Low cabin pressure aboard aircraft is not to blame for the rare but dangerous blood clots that some passengers get during long flights.

    By Ben Harder
  4. Astronomy

    Not a planet?

    New observations add to the evidence that an image of a planetary-mass object discovered beyond the solar system is not that of a bona fide planet.