FILE PHOTO: Stephen Hawking arrives at the UK premiere of the film “The Theory of Everything” which is based around his life, at a cinema in central London

FILE PHOTO: Stephen Hawking arrives at the UK premiere of the film “The Theory of Everything” which is based around his life, at a cinema in central London

FILE PHOTO: Stephen Hawking arrives at the UK premiere of the film “The Theory of Everything” which is based around his life, at a cinema in central London, Britain, December 9, 2014. REUTERS/Andrew Winning/File Photo