If you had a billion dollars to donate, how would you spend it?

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"When Cari Tuna and her future husband, Dustin Moskovitz, a Facebook co-founder, decided they would give away most of their multibillion-dollar fortune to charity, they thought of asteroids," writes Ariana Eunjung Cha for the Washington Post.
Or more specifically, the risk of one slamming to Earth and causing mass destruction.
It was one of many early ideas and it wasn’t that they had any special passion for or expertise in the subject, but it wasn’t a joke either. In trying to figure out how they could make the maximum impact with their money, the couple wanted to cast as wide a net as possible and systematically evaluate every cause on its merits.
No matter how wacky or intractable a problem may seem at first glance.
“We wanted to include anything that could seriously derail humanity’s progress,” Tuna explained in a recent interview. “It’s a pretty scary list.”
Today's Question: If you had a billion dollars to donate, how would you spend it?
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