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The Theory of Everything is a popular book disowned by Stephen Hawking although put together with material written by him. The title is in reference to the theory of everything, a physicists' jargon term for a theory in physics which unifies the four fundamental forces of nature: gravity, the strong nuclear force, the weak nuclear force, and the electromagnetic force.
Several years ago Stephen Hawking said that there was a fifty-fifty chance that an actual unification of the four fundamental forces - a Theory of Everything - would be achieved. Recently, however, he has become a bit more pessimistic about the chances of that happening.
Hawking's own website, on the page http://www.hawking.org.uk/info/iindex.html, makes the following comment: