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
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Passengers on the Beijing subway can pay with plastic bottles.
29
There's a regenerative candle that creates a new candle as it melts.
20