Harrison's book runs through a whole bunch of popular paranormal, pseudo-scientific, and other beliefs not overly burdened with proof, from Nostradamus and psychics to flying saucers and astrology, from homeopathy and anti-vaccination theories to creationism and the power of prayer, from ghosts and Bigfoot to Atlantis and end-of-the-world prophecies. He gives each theory five or eight pages, in a breezy, journalistic style, and explains why each of them is not, strictly speaking, true.
I read about half of it before I stopped, and I stopped only because Harrison was telling me things I already knew, and telling me them in less detail than I already knew. If Harrison was a flashier writer, or more aggressive in his investigations, I would have read further, but it's a good basic book by someone trying hard not to alienate an audience of believers in the irrational. I am happy to see that therapeutic touch and "memory water" have been debunked enough that they don't need to be included here, though disappointed that ancient astronauts and the Bermuda Triangle are still going strong in the public mind.
This is an excellent introduction to the skeptical literature, with extensive lists of resources in each chapter and a tone that verges on the conciliatory at times; Harrison bends over backward to be fair to people who believe in stupid, irrational things for no good reason. Even the title bends in that direction: it implies but does not actually say that these beliefs are of note because they're not true.
I didn't need to finish 50 Popular Beliefs myself, but I was thrilled to see that my local library had it, and I hope it circulates widely. It's an excellent handbook of the current catalog of popular irrational beliefs, and, I hope, a signpost on the road to knowledge to many people who ignorantly believe one or more of those things. It's probably a rude gift to give to that astrology-loving friend -- and he might not read it anyway -- but it should do some good in the world, and I'm very happy to see it exists.
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