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BEIJING - JUNE 21:  British scientist Stephen Hawking attends a conference during the 2006 International Conference on String Theory on June 21, 2006 in Beijing, China. Hawking is visiting Beijing to attend the conference on the riddle of string theory which, if solved, could help unlock the mysteries of black holes and the creation of the universe, according to reports.  (Photo by Cancan Chu/Getty Images)
BEIJING - JUNE 21:  British scientist Stephen Hawking attends a conference during the 2006 International Conference on String Theory on June 21, 2006 in Beijing, China. Hawking is visiting Beijing to attend the conference on the riddle of string theory which, if solved, could help unlock the mysteries of black holes and the creation of the universe, according to reports.  (Photo by Cancan Chu/Getty Images)

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CNN speaks to author James Barrat about a warning from Stephen Hawking about the dangers of artificial intelligence.