Author Dr. Seuss wrote the book "Green Eggs and Ham" because the editor made him a bet that he could not write a book, which contained less than fifty words.

After the Krakatoa volcano eruption in 1883 in Indonesia, many people reported that, because of the dust, the sunset appeared green and the moon blue. The moon was said to appear blue for almost two years.

San Francisco cable cars are the only National Monuments that move.

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