Physicist Stephen Hawking visits LA stem cell lab

Associated Press
Physicist Stephen Hawking visits LA stem cell lab

In this photo provided by Cedars-Sinai, British cosmologist Stephen Hawking, who has motor neuron disease, gives a talk titled "A Brief History of Mine," to workers at Cedars-Sinai Medical Center in Los Angeles, on Tuesday, April 9, 2013. (AP Photo/Cedars-Sinai, Eric Reed)

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