Solving The Evolutionary Puzzle Of Menopause

Menopause in women and females from a few other "higher" species is probably a fluke of nature rather than evolution at work, according to a study published Wednesday.

Biologists have long puzzled over why women lose the capacity to reproduce during roughly the last third of their lives.

Another, less polite, way scientists frame the question is this: why do females from a handful of species -- including killer whales -- continue to live well beyond the age when they can bear offspring?

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