Robert Bruce Thompson is a coauthor of Building the Perfect PC, Astronomy Hacks, the Illustrated Guide to Astronomical Wonders, and the Illustrated Guide to Home Chemistry Experiments. Thompson built his first computer in 1976 from discrete chips. It had 256 bytes of memory, used toggle switches and LEDs for I/O, ran at less than 1MHz, and had no operating system. Since then, he has bought, built, upgraded, and repaired hundreds of PCs for himself, employers, customers, friends, and clients. Thompson reads mysteries and nonfiction for relaxation, but only on cloudy nights. He spends most clear, moonless nights outdoors with his 10-inch Dobsonian reflector telescope, hunting down faint fuzzies, and is currently designing a larger truss-tube Dobsonian (computerized, of course) that he plans to build.