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Preschoolers demonstrate humankind's social-learning prowess Web edition : Thursday, March 1st, 2012 Preschool kids angling for a reward display social skills that may, on a grander scale, turn human cultures into cauldrons of change and innovation.

Nearly three-quarters of California teenagers live or go to school in neighborhoods disproportionately crowded with fast food and other outlets that sell unhealthy food, including convenience stores, liquor stores, dollar stores and pharmacies.