Depression

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<p>Geoff Watts meets researchers looking for clues to the origins of depression as a way of finding new solutions to treating it. </p><p>In the first of two programmes Geoff talks to the father of evolutionary medicine, Randolph Nesse and asks why hasn't natural selection made us less vulnerable to psychological diseases? </p><p>Could it be that depression is in some way useful to our lives?</p><p>(Image: A depressed young boy. Credit: Science Photo Library)</p>