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The Dragons of Eden
Very readable and interesting, for the layperson and scientist alike.
The Demon-Haunted World: Science as a Candle in the Dark
An important book. Why, in this "enlightened" age, are the 900 -number psychic lines so popular and reports of UFO kidnappings commonplace? People still think crop circles are unexplained phenomenon. Why? Sagan shows the role of science throughout history in trying to be a "candle in the dark" and offers answers to today's superstitions.