US
The university said the historic thesis was the most-demanded item in its online repository
Arnav Sharma scored 162 in an IQ test
Physicist says mankind is running out of time
Richard Branson offered the physicist a seat, which he immediately accepted
'Technology has advanced at such a pace that aggression may destroy us by nuclear or biological war' says Hawking
Hospital sources say Hawking is in a good condition and is returning to Britain
Cosmologist speaks out on one of humanity's greatest challenges
Hawking warned technological developments also posed a risk to our civilisation
'We need to be part of a larger group of nations, both for our security and our trade' he says