Celebrated physicist Stephen Hawking knows more about the universe than almost any other person ever to walk the planet, but some answers still escape even him.
When asked by ABC News' Diane Sawyer about the biggest mystery he'd like solved, he said, "I want to know why the universe exists, why there is something greater than nothing."
Hawking, who was honored last week at the World Science Festival in New York, is famous for probing the deepest questions of the cosmos.
Dr. Jason Lisle | 6/1/2005
