Kobus alerted his managers that a supervisor was allowing favorite employees to take time off for their birthdays, so the government had to pay more for other people at the agency to work overtime. "You know, this is not our money. This is the taxpayers' money, and I want it to be correct," he says. Courtesy of Robert Kobus hide caption

Martha and Alvaro Galvis used to travel from New Hampshire to Boston to watch the marathon every year. Both were hurt in the bombing two years ago. Jesse Costa/WBUR hide caption

John Wilkes Booth was the son of prominent, wealthy actors. He, too, became an actor and was so popular, he was one of the first to have his clothes ripped off by fans. Hulton Archive/Getty hide caption

Joel Heitkamp smiles while broadcasting in 2009 at AM radio station KFGO in Fargo, N.D. Elaine Thompson/AP hide caption

Students take the annual College Scholastic Ability Test, or college entrance exam, at a high school in Seoul last November. Students face enormous pressure to do well on the test and get into a top university. Airplanes are grounded on the day of the test so they won't disturb the students. Ed Jones/AFP/Getty Images hide caption

Texas Rangers relief pitcher Lisalverto Bonilla throws during the fifth inning of a spring training baseball game against the Kansas City Royals on March 4, in Surprise, Ariz. He is scheduled to undergo Tommy John surgery this week. Charlie Riedel/AP hide caption

As China continues its massive economic growth, especially in cities, the government continues to severely limit people's rights. Is that system sustainable? Johannes Eisele/AFP/Getty Images hide caption

Workers pick asparagus in early April at Del Bosque Farms in Firebaugh, Calif. This year, some farmers in the state will get water, others won't, based on when their land was first irrigated. David Paul Morris/Bloomberg/Getty Images hide caption