Search Results for: Bears

6,907 results for: Bears

1. 

   Cooperative strangers turn a mutual profit

   In social exchanges, monkeys and people often appear to act according to the principle that "one good turn deserves another."

   By Bruce BowerSeptember 28, 2002

2. 

   Archaeology

   Early New World Settlers Rise in East

   New evidence supports the view that people occupied a site in coastal Virginia at least 15,000 years ago.

   By Bruce BowerSeptember 30, 2002

3. 

   Earth

   It’s high tide for ice age climate change

   Tides may sometimes be strong enough to tug Earth into an ice age.

   By Tina Hesman SaeyOctober 1, 2002

4. 

   Earth

   Impurities clock crystal growth rates

   A novel method for measuring tiny amounts of hydrogen-containing impurities allows researchers to determine growth rates along different directions in a quartz crystal.

   By Ivars PetersonOctober 4, 2002

5. 

   Astronomy

   Balloon Sounds Out the Early Universe

   A balloon-borne experiment circling Antarctica has measured the curvature of the universe and revealed that it's perfectly flat.

   By Ron CowenOctober 8, 2002

6. 

   Paleontology

   Fossils Hint at Who Left Africa First

   Fossil skulls found in central Asia date to 1.7 million years ago and may represent the first ancestral human species to have left Africa.

   By Bruce BowerOctober 25, 2002

7. 

   Bdelloids: No sex for over 40 million years

   Researchers find the strongest evidence yet for creatures that have evolved asexually for millions of years.

   By Susan MiliusNovember 1, 2002

8. 

   Earth

   Candid cameras catch rare Asian cats

   Remote cameras have confirmed that despite 30 years of armed conflict, jungle cats and many other large mammals continue to thrive in Cambodia.

   By Janet RaloffJanuary 10, 2003

9. 

   Planetary Science

   Martian leaks: Hints of present-day water

   In some of the coldest regions on Mars, water appears to have recently gushed from just beneath the surface, running down crater walls and steep valleys.

   By Ron CowenJanuary 17, 2003

10. 

    Health & Medicine

    Do liver stem cells come from bone marrow?

    Tests of liver tissue from people who've received liver or blood-marrow transplants show that stem cells in bone marrow can populate the liver as liver cells.

    By Nathan SeppaJanuary 21, 2003

11. 

    Predators shape river world top-down

    Hunting and no-hunting zones allow a rare test of the much-debated proposal that big carnivores shape their ecosystems from the top down.

    By Susan MiliusFebruary 24, 2003

12. 

    Animals

    Flowers, not flirting, make sexes differ

    Thanks to lucky circumstances, bird researchers find rare evidence that food, not sex appeal, makes some male and female hummingbirds look different.

    By Susan MiliusMarch 3, 2003