"One of New York Times Notable Books for 1997" Walter Alvarez is professor of geology at the University of California, Berkeley. Sixty-five million years ago, a comet or asteroid larger than Mount Everest slammed into the Earth, inducing an explosion equivalent to the detonation of a hundred million hydrogen bombs. Vaporized detritus blasted through the atmosphere upon impact, falling back to Earth around the globe. Disastrous environmental consequences...

"Winner of the 2003 Book Award in Science, Phi Beta Kappa" Andrew H. Knoll is the Fisher Professor of Natural History at Harvard University and a member of the National Academy of Sciences. A paleontologist by training, he has spent more than two decades working to integrate geological and biological perspectives on early life. Australopithecines, dinosaurs, trilobites--such fossils conjure up images of lost worlds filled with vanished organisms....