A new study offers evidence for the “grandma hypothesis” - why women live long past reproductive age and menopause, rare among animals, evolved. In 17th- and 18th-century communities, the younger the grandma and closer she lived to grandkids, the better chance they had of surviving early childhood.

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A new study offers evidence for the “grandma hypothesis” - why women live long past reproductive age and menopause, rare among animals, evolved. In 17th- and 18th-century communities, the younger the grandma and closer she lived to grandkids, the better chance they had of surviving early childhood.