In this photo provided by Cedars-Sinai, Stephen Hawking gives a talk to workers at Cedars-Sinai Medical Center in Los Angeles, on Tuesday, April 9, 2013.
http://science.nbcnews.com/_news/2013/04/09/17677461-stephen-hawking-visits-la-stem-cell-lab-where-his-disease-is-studied?lite
http://science.nbcnews.com/_news/2013/04/09/17677461-stephen-hawking-visits-la-stem-cell-lab-where-his-disease-is-studied?lite
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