Song of Myself was included in Walt Whitman's major work, Leaves of Grass. Whitman paid for the publication of the first edition himself. Three Lions/Getty Images hide caption

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Lange's "Migrant Mother" is one of her most famous photographs. Dorothea Lange/Courtesy of the Library of Congress hide caption

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Before he became the 26th president, Theodore Roosevelt (center) led the men of the 1st Cavalry Volunteers, known as the "Rough Riders," on San Juan Hill during the Spanish-American War in 1898. William Dinwiddie/Hulton Archive/Getty Archive hide caption

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James Earl Ray was sentenced to 99 years in prison for the murder of Martin Luther King Jr. Hulton Archive/Getty hide caption

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Sarah Silverman won an Emmy in 2008 for her video I'm F******* Matt Damon, which appeared on the Jimmy Kimmel Live show. Steve Agee hide caption

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Though people can become more forgetful in middle age, research suggests that they're at the top of their game in other areas, such as vocabulary and reasoning. hide caption

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Clarke says he would like to see a separate government Internet network that would be constantly monitored for signs of attack. hide caption

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Actor Michael J. Fox has written a new book aimed at graduates called A Funny Thing Happened on the Way to the Future. Bryan Adams hide caption

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An archive photo of Bellevue Hospital, the home of the tiny Bellevue Literary Press, which published Paul Harding's Tinkers. Courtesy of Bellevue Hospital Center Archives hide caption

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