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Optogenetics Illuminates Pathways of Motivation Through Brain, Stanford University Study  
11/19/2012 7:32:41 AM

Whether you are an apple tree or an antelope, survival depends on using your energy efficiently. In a difficult or dangerous situation, the key question is whether exerting effort—sending out roots in search of nutrients in a drought or running at top speed from a predator—will be worth the energy.
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