Given the wealth of evidence that smoking damages your health, you would have to be stupid not to kick the habit. Now a study suggests this could be a self-fulfilling prophecy, because smoking reduces your IQ.
A trick that persuades human eggs to divide as if they have been fertilised could provide a source of embryonic stem cells that sidesteps ethical objections to existing techniques. It could also be deployed to improve the success rate of IVF.
Next time you go for a stroll on Mars, be sure you don't leave any litter behind. A plan to keep parts of the red planet in their pristine state could see seven areas turned into 'planetary parks', regulated just like national parks here on Earth.
The scheme has been proposed by Charles Cockell, a microbiologist for the British Antarctic Survey in Cambridge, and Gerda Horneck, an astrobiologist from the German Aerospace Centre in Cologne, Germany.
A 38-year-old with degrees in psychology, education and computer science needed only 11.8 seconds to calculate the 13th root of a 100-digit number in his head, setting a new record, organizers said.
Onlookers with electronic calculators needed more time to solve the problem that Gert Mittring figured on his own, with two umpires checking the time, at a math museum in the small German town of Giessen near Frankfurt in western Germany.
Scientists flooded the Grand Canyon on Sunday to restore beaches and save fish and plants that have been disappearing since sediment-free water began flowing from a man-made dam 40 years ago.
A torrent of gushing water raced down the Colorado River and into the canyon, carrying badly needed natural sediment with it, as four giant steel tubes at the base of Glen Canyon Dam were opened.
"The sediment, sand, mud and silt play an important role in the ecosystem," said Chip Groat, director for the U.S. Geological Survey.