World Science: Comets may have come from other solar systems
* Comets may have come from other solar
Many of the best known comets may have been born
orbiting other stars, according to a new theory.
* "Power-hungry" image may hurt female, but not
Voters tend to punish female candidates for seeming
brazenly ambitious, but let the same quality slide
in males, a study suggests.
* Arctic ice at multi-millennium low:
Less ice covers the Arctic today than at any time in
the past few thousand years, a study concludes.
* Diversity within species may be as important as
Many past studies have focused on diversity of
species as a key factor in the health and resilience
of a natural environment.
* Oil spill threatens iconic fish with saw-like snout:
The huge spill spreading in the Gulf of Mexico could
finish off a critically endangered sawfish, an expert
* Surveillance technologies get more powerful:
* How acupuncture really works:
* Cockroaches may share food advice:
* Squirrels found to adopt orphans:
* Termites, not lions, may be kings in African grasslands:
* Off-kilter planetary system surprises astronomers:
* Fuel from sewage can be profitable: study:
* Could banknotes made like butterfly wings deter forgery?:
* Hey Jude: Get that song out my head!
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