25/08/2010

North American continent is a layer cake, scientists discover

(PhysOrg.com) -- The North American continent is not one thick, rigid slab, but a layer cake of ancient, 3 billion-year-old rock on top of much newer material probably less than 1 billion years old, according to a new study ...

Scientists say natural selection alone can explain eusociality

Scientists at Harvard University have sketched a new map of the "evolutionary labyrinth" species must traverse to reach eusociality, the rare but spectacularly successful social structure where individuals cooperate to raise ...

Scientists discover how chemical repellants trip up insects

Fire up the citronella-scented tiki torches, and slather on the DEET: Everybody knows these simple precautions repel insects, notably mosquitoes, whose bites not only itch and irritate, but also transmit diseases such as ...

'Greening' your flat screen TV

Electronic products pollute our environment with a number of heavy metals before, during and after they're used. In the U.S. alone, an estimated 70% of heavy metals in landfill come from discarded electronics. With flat screen ...

Germany to prevent Facebook checks

(AP) -- Ever thought twice about posting a party picture on Facebook, fearing it could someday hurt your chance at a dream job? A new German law is supposed to solve the problem by making it illegal for prospective employers ...

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