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Your search has returned 40 articles:
  • News

    Supernova Outbreak: X rays signal earliest alert

    Thanks to a lucky break and an overactive galaxy, astronomers have for the first time caught a massive star in the act of exploding. An X-ray outburst recently recorded by NASA's Swift satellite suggests that researchers began viewing the violent demise of a star in the galaxy NGC 2770 just a few seconds after the first X rays arrived at Earth, and hours before the first visible-light...

    03/05/2008 - 20:18 Astronomy
  • News

    Ocean ups and downs—the long view

    About 80 million years ago, no land-based ice sheets existed. Also, a larger proportion of the world's ocean crust rode higher than now on underlying mantle, so oceans were shallower.

    Computer models suggest that sea level then was about 170 meters higher than today, says R. Dietmar Müller, a geophysicist at the University of Sydney. Many areas that are now dry, including...

    03/05/2008 - 14:15 Earth
  • News

    A Way Forward: Releasing the brakes on cancer vaccines

    Scientists have tried for decades to create vaccines that spur a cancer patient's immune system into attacking tumors, but cancer cells cleverly defuse the attack. Research in mice now suggests a new way to overcome these defenses and rally the immune system to action.

    Previous attempts to defeat tumor defenses with a vaccine caused dangerous side effects by provoking the immune system...

    03/05/2008 - 13:56 Biomedicine
  • News

    Promiscuous orchids

    Some orchids use sexual deception to entice a pollinator, mimicking the scent of a specific female wasp, for example. This plant-pollinator monogamy maintains genetic isolation and prevents undesirable pollen from clogging up the works.

    But other orchids mimic nectar-bearing flowers, inviting a variety of visitors. These plants need a back-up plan to maintain species...

    03/05/2008 - 13:11 Plants
  • News

    Black Hole of Light: Laser pulses create model of event horizon

    If you've ever drifted so close to a waterfall that you could no longer swim fast enough to get away, then you pretty much know what it's like to fall into a black hole. Researchers have now created a laboratory analog of such a point of no return.

    "Space-time really behaves like a river," says Ulf Leonhardt of the University of St. Andrews in Scotland. "Gravity can be represented as if...

    03/05/2008 - 12:51 Physics