A teen in Michigan built a working nuclear reactor. He taught himself how to build it as a weekend hobby project in his basement from ages 15-17 for $3500.
8
Between 2007 and 2012, Bill Gates gave away $28 billion; saving 6 million lives.
34
In Montreal, there's a bus stop with swings that play musical notes when you swing on them.
20
When the 2013 government shutdown threatened the closing down of a national program giving medical attention and meals to children, John D. Arnold donated $10 million of his own money to keep it afloat.
21