From this simple idea have come the science of high-energy physics, the technology of particle accelerators, and a revolution in our understanding of matter, space and time.

Ernest Lawrence's first cyclotron had an energy of 80 thousand volts and a circumference of 32 inches. Lawrence could hold it in his hand. Today's most powerful particle accelerator, the Tevatron at the Department of Energy's Fermilab, has an energy of two trillion electron volts and a circumference of four miles. In between came many intermediate machines. Each generation of particle accelerators build on the accomp-lishments of the previous ones, raising the level of technology ever higher.

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