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Associated Press
In this photo provided by Cedars-Sinai, British cosmologist Stephen Hawking, left, listens to a presentation by Robert H. Baloh, MD, PhD, the Director of Neuromuscular Medicine in the Department of Neurology, center, and Clive Svendsen, PhD, director of the Cedars-Sinai Regenerative Medicine Institute, as they give him a tour of the Regenerative Medicine Institute at Cedars-Sinai Medical Center on Tuesday, April 9, 2013 in Los Angeles. (AP Photo/Cedars-Sinai, Eric Reed)

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