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Brain training games won't make you smarter? but a dose of blue light or an electrical shock just might

The slippery slope to obesity from New Scientist - Online News (2010-10-3 20:00)

Reward centres in the brain become less responsive as people gain weight causing them to eat more, reducing the reward response still further

A device that generates a wire representation of the spoken word performs double duty as a nifty jewellery maker

Tiny changes at the beginning make big differences in the end. That's why our existence is perilously perched on a great pyramid of trivia

With some scrap materials, a few cheap electronics and a bit of improvisation, even a child can build a $100 aircraft

Fertility treatments alter the natural sex ratio, with IVF more likely to produce boys while ICSI favours girls

Natural changes in the human body may leave biometrics systems inherently fallible? something their manufacturers will have to accept

Fresh pastures meant a cosier life for early humans? if they hadn't, we would never have loosened up enough to learn to speak

A 10-kilometre-wide rock did for the dinosaurs, but smashed open a window of opportunity for unimpressive little animals called mammals

All today's stories on newscientist.com, including: how to recruit a smart team, homebrew technology, Facebook movie, 3D without glasses, and more