This book is worthless. It's not even worth reviewing. Carl Sagan doesn't address any particular occurance in detail (maybe a paragraph), he just generalizes things. Essentially this book is a waste of time. Read some Joe Nickell instead.The author talks about aliens and UFOs, but he doesn't review any of the important cases. You won't learn anything after finishing this book. He doesn't even show pictures of the things he calls fake.I'm a skeptic myself, but I think this is the most overrated book of the "skeptic genre." This is only for lazy people. I wouldn't suggest this book to somebody in an attempt to convert them, because, like I said, it's worthless. It may, however, put them to sleep.