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New Hypothesis Explains Why We Sleep

During sleep, the brain weakens the connections among nerve cells, apparently conserving energy and, paradoxically, aiding memory

By Giulio Tononi and Chiara Cirelli

Big Data Makes Big Inroads into Schools

Introduction to a special report on the ways technology is remaking every aspect of education—bringing top-notch courses to the world's poorest citizens and reshaping the way all students learn



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20% off Scientific American Health & Medicine

20% off Scientific American Health & Medicine