Gods in Chariots and Other Fantasies

Sensible answers to the idea still floating around today (espoused so popularly in the 1970's by Erich Von Daniken's "Chariots Of The Gods" and its sequels) that life on earth was started and/or helped along by visitors from outer space. Clifford has a Ph.D. yet writes on everyone's level. An informative and eye opening read that is definitely worth your time.