Behavior: The Prospects for Living Even Longer

THE biology of aging is no better understood today than was the circulation of the blood before William Harvey. "We probably age because we run out of evolutionary program," according to Dr. Alexander Comfort, director of the Medical Research Council Group on Aging at University College, London. "In this we resemble a space probe that has been 'designed' by selection to pass Mars, but that has no further built-in instructions once it has done so, and no components specifically produced to last longer than that. It will travel on, but the failure rate...

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