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Your search has returned 48 articles:
  • News

    Climate not really what doomed large North American mammals

    Evidently, my dear Watson, the climate didn’t do it. Scientists weighing in on a cold case open since the end of the most recent ice age — the massive die-offs of North America’s largest mammals — arrived at that conclusion courtesy of some very tiny clues. The spores of a fungus that thrived in and on those creatures’ dung suggest changes in habitat didn’t cause the extinctions. As a result...

    11/19/2009 - 14:24 Life & Evolution
  • News

    Networks reveal concentrated ownership of corporations

    Researchers have made the first maps of corporate stock ownership for the stock markets of a large number of countries, 48 in all. The new network analysis technique reveals “backbones” in these ownership networks: big players that together own a controlling stake in more than 80 percent of the companies in the markets.

    In these network diagrams, nodes represent either a company with...

    02/13/2009 - 18:37 Numbers
  • Food for Thought

    Troubling Meaty 'Estrogen'

    Women take note. Researchers find that a chemical that forms in overcooked meat, especially charred portions, is a potent mimic of estrogen, the primary female sex hormone. That's anything but appetizing, since studies have linked a higher lifetime cumulative exposure to estrogen in women with an elevated risk of breast cancer.

    Indeed, the new finding offers a "biologically...

    10/17/2007 - 01:38 Nutrition
  • Feature

    Restoring Scents

    Betty (not her real name) remembers the day 9 years ago when she fully experienced an orange. As she split the fruit's skin, citrus scents sprayed into the air and the 51-year-old woman experienced a sensory epiphany: "Whoa! This is an orange. My God, this is what an orange smells like."

    Even now, she says, recalling that day "makes me tear up because that orange...

    07/02/2007 - 11:49 Biomedicine
  • Food for Thought

    New Estimates of the Shark-Fin Trade

    Immense numbers of sharks each year are slaughtered for their fins—not meat, just their fins. This harvest helps feed a growing appetite throughout Asia for a popular soup, one with snob appeal comparable to that of caviar. Indeed, a single bowl of shark-fin soup can cost $100 in a high-end Hong Kong restaurant.

    The key ingredient of shark-fin soup is...

    11/01/2006 - 13:22 Earth & Environment
  • Food for Thought

    Cola May Weaken Women's Bones

    Middle age and older women may want to limit their consumption of cola-flavored soft drinks. A new study links regular consumption of these beverages with reduced mineral density of hip bones in women past menopause. No similar hip vulnerability to cola showed up in men of the same age.

    The gender-specific finding was quite strong, notes Katherine L. Tucker of the Jean Mayer USDA...

    10/24/2006 - 10:09 Nutrition
  • Feature

    Venting Concerns

    Researchers cruising the South Pacific between Tonga and Fiji study huge snails that, aided by an abundance of bacteria housed in their gills, feed off plumes of metal-rich compounds at active hydrothermal vents. Scientists working off the California coast use chemical-sniffing probes, robotically driven subs, and seafloor-tethered temperature sensors to watch flows of lava pave over a once-...

    10/03/2006 - 10:43 Humans & Society
  • News

    Underage Spiders: Males show unexpected interest in young mates

    To the surprise of biologists, a male Australian redback spider will mate with a juvenile female before her reproductive tract has an external opening. The male bites through the immature female's outer covering and by doing so, protects his own life.

    This discovery adds a new twist to a textbook example of extreme mating practices. Until now, biologists had focused on these...

    08/23/2006 - 11:47 Animals
  • News

    Social jet lag: Need a smoke?

    From Munich, at the Euroscience Open Forum meeting

    People who have a hard time waking in the morning because their bodies' internal clocks are out of sync with their sleep schedules are said to have "social jet lag." Researchers in Europe have determined that the phenomenon strongly correlates with smoking.

    Battling one's biological clock can leave people weary in the same way as...

    08/01/2006 - 12:19 Other
  • News

    Wary male spiders woo lifelessly

    Certain male spiders confront the threat of a cannibalistic female with a novel tactic: They play dead while having sex.

    Nursery spiders (Pisaura mirabilis) belong to a family known for violent females that, on occasion, attack and eat males attempting courtship, notes Trine Bilde of Århus University in Denmark.

    Biologists already knew that males of this species have one method...

    03/28/2006 - 11:53 Animals