Hawking with University of Oxford librarian Richard Ovenden (left) and naturalist David Attenborough (right) at the opening of the Weston Library, Oxford, in March 2015. Ovenden awarded the Bodley Medal to Hawking and Attenborough at the ceremony.Hawking holding a public lecture at the Stockholm Waterfront congress center, 24 August 2015Hawking taking a zero-gravity flight in a reduced-gravity aircraft, 2007Stephen Hawking being presented by his daughter Lucy Hawking at the lecture he gave for NASA's 50th anniversary
