A selection of four lectures by Professor Hawking:
1. April 21, 2008. Stephen Hawking speaks on "Why Go Into Space?" for NASA's 50th Anniversary lecture series at George Washington University. The talk was in two parts, which are seamlessly edited together into this 25-minute presentation
2. March 13 2007. Stephen Hawking gives a lecture in Berkeley on the Hawking-Hartle no boundary universe.
3. Jul 26, 2008. Stephen Hawking lecture after receiving the "Fonseca Prize 2008", from the Universidade de Santiago de Compostela, "For his exceptional mastery in the popularization of complex concepts in Physics at the very edge of our current understanding of the Universe, combined with the highest scientific excellence, and for becoming a public reference of science worldwide "
4. October 13, 2003. Stephen Hawking presented the 2003 Michelson Morley Award Lecture, A Brane New World. Recorded at Severance Hall.