Friday

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A counter-demonstrator squares off with immigrant rights supporters during a protest outside Wrigley Field before the start of the Cubs game against the Arizona Diamondbacks Thursday in Chicago. Dozens of people demonstrated outside the park calling for a boycott of the series to protest the passage of Arizona's controversial immigration law. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images
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Tuesday

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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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William Dinwiddie/Hulton Archive/Getty Archive
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Monday

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Researchers Evgenia Ilyinskaya and Asgerdur Sigurdardottir sweep up volcanic ash from a small bridge just south of the Eyjafjallajokull volcano. The ash will be taken back to the University of Iceland for analysis. Joe Palca/NPR hide caption

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Joe Palca/NPR
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