CAMBRIDGE, CAMBRIDGESHIRE - NOVEMBER 21: Professor Stephen Hawking addressing The Cambridge Union on November 21, 2017 in Cambridge, Cambridgeshire. (Photo by Chris Williamson/Getty Images)
CAMBRIDGE, CAMBRIDGESHIRE - NOVEMBER 21: Professor Stephen Hawking addressing The Cambridge Union on November 21, 2017 in Cambridge, Cambridgeshire. (Photo by Chris Williamson/Getty Images)