diverting so much attention to living longer, we may sacrifice 'our chance for living as well as we can and for satisfying to some ex- tent. . . our deepest longings for what is best."

SCIENCE & TECHNOLOGY
"Chasing Particles of Unity" MichaelAfter E =me2 Gold, in Science 83 (Mar. 1983), P.O. Box
10790, Des Moines, Iowa 50340.
Physicists have identified the particles responsible for three of nature's four basic forces-electromagnetism, gravity, and the so-called "strong for...