British theoretical physicist Stephen Hawking, Professor at the University of Cambridge, delivers a lecture on "The creation of the universe" for the 450th anniversary of the University of Geneva, in Geneva, Switzerland, Tuesday, Sept. 15, 2009. The presentation marks the sixth in a series of academic conferences organized by the university. (AP Photo/Keystone, Salvatore Di Nolfi)

Use Information This content is intended for editorial use only.
For other uses, additional clearances may be required.