Owen Chamberlain won the 1959 Nobel Prize in physics for confirming the existence of the antiproton. He shared this honor with his colleague of many years, Emilio Segrè. The antiproton was hypothesized as being a mirror image of the proton, a particle found in the nucleus of atoms. Proving the existence of the antiproton confirmed that idea of atomic symmetry; it was also an important breakthrough for particle physicists in their study of antimatter. Chamberlain and Segrè's work in high-energy physics at the University of California, Berkeley, was made possible by the development of the bevatron particle accelerator. This powerful accelerator, which was built at Berkeley, was able to fire protons of 6.2 billion electron volts, a nuclear force far stronger than the energy generated by the hydrogen bomb or by stars. Prior to his work at Berkeley, Chamberlain had done atomic research for the Manhattan Project...