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Your search has returned 18 articles:
  • News

    Floral Shocker: Blooms shake roots of flowering-plant family

    Imagine discovering a mammal without mammary glands or an insect with eight legs. Aquatic herbs in the genus Hydatella pose a similar paradox—they lack a defining developmental feature of flowering plants, raising questions about their evolution and rampant speciation during the past 135 million years.

    Evolutionary biologists group together organisms that share unique traits...

    03/19/2008 - 13:25 Plants
  • News

    Holding up

    Michelangelo's David is just as buff as he was 500 years ago, when he was sculpted from marble. But the statue shows stress from holding up its weight for so long. On March 18 in Honolulu, researchers at the International Conference on Computational and Experimental Engineering and Sciences presented a new study of David's frame.

    Vadim Shapiro of the University of Wisconsin–...

    03/19/2008 - 12:57 Technology
  • News

    New Recipe for Pollution Stew: Another chemical culprit adds to ozone

    A chemical reaction long assumed to be unimportant in urban air quality may be a significant source of ozone, the major component of smog.

    Hydroxyl (OH) radicals, among the most reactive natural chemicals in the atmosphere, help cleanse the air of some noxious pollutants. In many cases, and especially in urban environments, ozone results from that cleansing, says Amitabha Sinha, a...

    03/19/2008 - 12:46 Earth & Environment
  • News

    In the Beginning: More early clues for life at home, out there

    Astronomers have just moved closer to understanding how the raw ingredients for life may have arisen on Earth as well as on planets light-years beyond the solar system.

    One team, using the Hubble Space Telescope, has for the first time detected an organic molecule in the atmosphere of a planet orbiting another star. Although the orb can't support life, the discovery bodes...

    03/19/2008 - 12:20 Astronomy
  • News

    Long-life Link: Gut protein ties low insulin to longevity

    Roundworms low on insulin tend to live longer, and a new study identifies a protein that helps explain the effect. Low insulin levels increase this protein's activity in the gut, where the protein can extend longevity by helping cells avoid damage.

    Humans and other mammals have a similar group of proteins, suggesting that insulin probably affects the proteins' activity in people as well...

    03/19/2008 - 11:38 Biomedicine
  • News

    Finch Concerts: Female bird brain notes male attention

    He knows she's listening. And now we know that she knows he knows.

    Using the word "know" loosely, that's a simplified version of a new analysis of zebra finches by neuroscientists at the University of California, San Francisco.

    Sarah Woolley explains that males sing a song differently when they're in front of females than when they're just twittering to themselves. Now...

    03/19/2008 - 11:18 Animals
  • News

    Love Code: A twist of light only mantis shrimp can see

    For love, some would twist the laws of physics. Short of doing that, mantis shrimp communicate with the other sex by spinning light waves, biologists find. The feat seems to be unique to this animal.

    Light is made of electromagnetic waves. These are electric and magnetic fields that wiggle perpendicular to each other and to a light ray's direction. Many invertebrates have...

    03/19/2008 - 11:00 Animals
  • News

    Bad Blood? Old units might be substandard

    Unsettling new evidence suggests that blood stored for more than 2 weeks might be less beneficial to recipients recovering from cardiac surgery than is fresher blood. While the study falls short of heralding a wholesale change in blood-banking practices, scientists agree that it exposes the need for a large trial to determine the optimal shelf life of stored blood. The current limit is 42...

    03/19/2008 - 10:23 Biomedicine
  • News

    People move like predators

    From New Orleans, at a meeting of the American Physical Society

    Every morning is the same: You get up, shower, and eat breakfast, and you're ready to go. On a hunt.

    If hunting is not in your daily routine, it might as well be, or so it could seem to someone tracking your movements. A new study based on data from cell phone use shows that people's daily roaming mirrors familiar...

    03/18/2008 - 19:57
  • News

    A sticky issue

    From New Orleans, at a meeting of the American Physical Society

    Old decals die hard. Try removing one from a wall by pulling its side, and usually only a small wedge will come off. The same tends to happen with pieces of adhesive tape. Unless the glue is weak or the tape is strong and doesn't break, the removal takes patience.

    "Why is it so frustrating?" says Benoît Roman of the...

    03/18/2008 - 19:41 Materials