If you are in a special relationship with another person, thank grandma — not just yours, but all grandmothers since humans evolved. The grandma hypothesis holds that the key to why moms can have next babies sooner is not because of dad bringing home the bacon but because of grandma helping feed the weaned children, the authors explain.
http://www.sciencedaily.com/releases/2015/09/150907190633.htm
Did grandmas make people pair up?
7 septiembre 2015
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