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It evolved in humans along with intelligence to make them more adept at avoiding danger. A study of 42 people found the worst sufferers of a common anxiety disorder had a higher IQ than those whose symptoms were less severe. Scientists say their findings published in Frontiers in Evolutionary Neuroscience, suggest worrying has developed as a beneficial trait. Psychiatrist Professor Jeremy Coplan, of SUNY Downstate Medical Centre in New York, and...
