Sandy Field, Ph.D., is a freelance science writer based in Lewisburg, Pa. She holds a B.S. degree in genetics from the University of California, Davis and a Ph.D. in biochemistry, cell and molecular biology from Cornell University in Ithaca, N.Y. She specializes in continuing medical education, writing in the areas of oncology and infectious disease. Her other passions include science fiction, forensic science, San Francisco Giants baseball, bicycling, Tae Kwon Do and cooking for her family. Visit her Web site at www.fieldscientific.com.