The Flying Circus of Physics is a book by Jearl Walker. It is a collection of over 600 observational oddities, some of which can easily be explained, some are enormously difficult to explain. One edition of the book is subtitled "WITH ANSWERS", as the original edition did not make any attempt to explain the phenomana. Some of the "answers" merely say that nothing is known. It has 1632 references to scientific books and papers. My copy appears to date from 1977, but this webpage refers to a second edition, completely rewritten and redesigned:
Flying Circus of Physics - The Book
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