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Stephen Hawking dead at 76
The British astrophysicist was the most famous scientist since Einstein.
Usain Bolt takes on laws of physics in zero gravity race00:56
As NASA launches historic mission to the sun, meet the man who inspired the project01:50
Stretch of Utah desert used as training ground for mission to Mars01:54
San Diego Zoo hopes to end extinction using frozen cells02:14
Why we crave the thrill of danger and surviving it02:11
How genetic genealogy can help solve decades-old crimes01:44