The author of several popular science books here ventures to tell the intriguing story of the Ice Ages, where scientific truth, or at least conjecture, reads like fantasy-fiction. The glacial periods are traced and, interspersed in a somewhat disorganized manner, are touches of human evolutionary theory and archaeology, interesting geological oddities and techniques, some venerable earth history and even forecasts for the future. Are we headed for a tropical epoch or a renewed onslaught of ice? Young people will find the popular style appealing.