Video: How do black holes evaporate?

Nothing lasts forever, not even black holes. According to Stephen Hawking, black holes will evaporate over vast periods of time. But how, exactly, does this happen?

Scientists urge artificial intelligence safety focus

The development of artificial intelligence is growing fast and hundreds of the world's leading scientists and entrepreneurs are urging a renewed focus on safety and ethics to prevent dangers to society.

Too risky to phone ET? Too late -- NASA's tried it

(AP) -- Stephen Hawking says it is too risky to try to talk to space aliens. Oops. Too late. NASA and others have already beamed several messages into deep space, trying to phone E.T.

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