April 21 is the 100 year anniversary of the death of Mark Twain (November 24, 1832 - April 21, 1910). A keen observer of human nature, Twain's stories portray America as it became a nation. An American humorist, lecturer, essayist, and author, several of Twain's books have been adapted for the screen including The Adventures of Huckleberry Finn, Life on the Mississippi, and a present-day version of The Prince and the Pauper.