From the files of "Discover Magazine", a leading source of popular science, "Discover" is one of the foremost journals of popular science, pitched to a layman's level. One of the most eagerly awaited monthly features is the 20 Things You Didn't Know About column, which occupies the last page of the magazine. This book takes the best of these columns, but more than just that, the editors at "Discover" have expanded each one into a book-length chapter, telling the story behind the science in a lively, appealing way.