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DARK DAYS A controversial new study concludes that major depression does not afflict more people during winter months.


A humanoid robot named Hubo uses a mechanical hand to turn a valve at the finals of the DARPA Robotics Challenge in California.


LEAFY GREENS Tinkering with Europe�s forests has increased populations of dark-leafed conifer trees that reflect less sunlight (pine forest in Germany, shown), compared with lighter-colored broad-leaved trees, and so has failed to alleviate climate change, new research shows.

soccer players

HEADS UP The brain needs time to recover between brain injuries, a study in mice suggests. The finding may help doctors understand potential injuries to athletes, including soccer players who repeatedly head the ball.


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