This is a short article from Reader's Digest that I thought was cool. I can't find it online so I will type it out here:
The Grandma Theory
We will always remember how Grandma gave us cookies, great birthday presents, and....longevity? According to a new study published in the journal Proceedings of the Royal Society B, humans developed longer life spans because grandmothers began looking after their grandchildren millions of years ago. With grandmas helping out at home (or, more appropriately, around the cave), prehistoric mothers were able to have larger families, according to study author Kristen Hawkes. The result: Grandmothering set into motion evolutionary changes, like bigger brain size and long-term monogamous bonding between individuals- all because Nana wanted to play tea party with the kids and read the occasional bedtime story.
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