*Science in Dispute*. ©2005-2006 Thomson Gale, a part of the Thomson Corporation. All rights reserved.

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## Viewpoint: Yes, History, Recent Advances, and New Technologies Provide Reasonable Hope That a Grand Unified Theory May Be Within Reach.

### Physics as a History of Unification

The history of physics, especially following the publication in 1687 of Isaac Newton's *Philosophiae Naturalis Principia Mathematica* (Mathematical principles of natural philosophy), reveals a strong tendency toward the unification of theories explaining different aspects of the universe. The work of Newton, an English physicist and mathematician, advanced that of the Italian astronomer and physicist Galileo Galilei and unified the theories of celestial mechanics with empirically testable theories of gravity into a theory of universal gravitation. By asserting a mutual gravitational attraction between all particles in the universe, Newton's theory brought a mathematical and scientific unification to the cosmos for the first time.

In the early years of the twentieth century...

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