Green Eggs and Ham by Dr. Seuss is an easy to read, rhyming story for children. It was first published in 1960. The book is about someone who is certain he will not like the green eggs and ham (but who has not tasted them yet). It is a cumulative story which starts with a simple phrase and builds on it, adding a new phrase or sentence with each repetition.
According to Snopes.com, the urban legend investigation site, it is true that Dr. Seuss wrote this book in response to a challenge from his editor to write a book that used fewer than 50 different words. 
According to Wikipedia:
- The fifty words used are: a, am, and, anywhere, are, be, boat, box, car, could, dark, do, eat, eggs, fox, goat, good, green, ham, here, house, I, if, in, let, like, may, me, mouse, not, on, or, rain, Sam, say, see, so, thank, that, the, them, there, they, train, tree, try, will, with, would, you.
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