Three years ago, Rufus McDonald found historic documents in an abandoned house and took them to a rare-books dealer. The papers and books belonged to Richard T. Greener, a 19th century intellectual who was the first African-American to graduate from Harvard University. Cheryl Corley/NPR hide caption

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Dannaer Fields, who went by Donna, is shown in this undated photo. She was one of three people killed in Friday's shootings in Tulsa, Okla. Courtesy Of News On 6 hide caption

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Alvin Watts (left), 33, and Jacob England, 19, were arrested following an appeal to the public to help police solve the five shootings that happened Friday. A police spokesman said the two face three counts of first-degree murder and two counts of shooting with intent to kill. AFP/Getty Images hide caption

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Florida State Attorney Angela Corey (center) has been assigned to lead the investigation into the shooting death of Florida teenager Trayvon Martin. Kelly Jordan/The Florida Times-Union hide caption

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Rep. Jesse Jackson Jr. and his wife, Chicago alderman Sandi Jackson, ask each other for their support and votes as they arrive at a polling station for early voting in Chicago on March 9. M. Spencer Green/AP hide caption

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The University of North Dakota's Brad Eidsness makes a save during a game against the Minnesota Golden Gophers. Since 2005, there have been a series of lawsuits and legislative actions over the nickname for the school's athletic teams, the "Fighting Sioux." Josh Holmberg/AP hide caption

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Applicants fill out forms at a Miami jobs fair hosted by the Congressional Black Caucus. An NPR/Kaiser survey found blacks make up about 10 percent of the full-time working population but 27 percent of the long-term unemployed. Lynne Sladky/AP hide caption

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