Britain's Professor Stephen Hawking receives the Honorary Freedom of the City of London during a ceremony at the Guildhall in the City of London. Cambridge University has put Stephen Hawking's doctoral thesis online on Monday, Oct. 23, 2017, triggering such interest that it crashed the university's website. Completed in 1966 when Hawking was 24, "Properties of Expanding Universes" explores ideas about the origins of the universe that have resonated through the scientists career. (AP Photo/Matt Dunham, file)
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