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sleepless babies: Newborn dolphins and killer whales don't sleep for a whole month after birth, says a study by a team led by Jerome Siegel of the University of California at Los Angeles, US. The mothers also stay awake over the period to keep a close eye on their offspring.
The observation is surprising given that other animals, such as rats, die if forcibly denied sleep. And in humans, as any new parent will vouch, sleep deprivation is a form of torture.
cancer alarm: Biologists at the University of California, Berkeley, have found damage to a cell's DNA triggers a chain reaction that causes increased expression of a marker recognised by the body's immune system. The study sheds light on a long-standing question of how the natural killer cells
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