David Grinspoon is principal scientist in the Department of Space Studies at the South-west Research Institute, and adjunct professor of Astrophysical and Planetary Sciences at the University of Colorado. His previous book, Venus Revealed, was a Los Angeles Times Book Prize finalist. An adviser for NASA on space exploration strategy, he lectures widely and has appeared on numerous television and radio programs. His writing has appeared in Astronomy, Nature, Science, Scientific American, Natural History, and The Sciences. He maintains the Funky Science Web site at www.funkyscience.net.