Museum displays include examples of robes worn by the men, women and children of the Ku Klux Klan. Bill Bitzinger/Ferris State University hide caption

itoggle caption Bill Bitzinger/Ferris State University

Karen Lindsfor, a professor of radiology and chief of breast imaging at the University of California, Davis Medical Center, examines the mammogram of a patient with heterogeneously dense breast tissue. Lindfors is among those doctors who say there was insufficient evidence to support the idea that additional screenings would detect cancers earlier. Rich Pedroncelli/AP hide caption

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A priest prays before a Mass celebrated by Pope Benedict XVI at the Cuatro Vientos air base outside Madrid during World Youth Day festivities in August 2011. The Catholic Church is hoping to provide an attractive option for young job seekers in Spain, which is suffering from unprecedented unemployment. Jorge Guerrero/AFP/Getty Images hide caption

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The current case of a prominent Chinese activist seeking U.S. protection has echoes of a similar episode in 1989. Then, physicist Fang Lizhi took refuge at the U.S. Embassy in Beijing. He spent a year there before the U.S. and China reached a deal allowing him to move to the U.S. He died this month in Arizona, at age 76. John B. Carnett/Popular Science via Getty Images hide caption

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Demonstrators with Guy Fawkes masks protest changing privacy policies on March 31, in Vienna. Ronald Zak/DAPD/AP hide caption

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Israeli Prime Minister Benjamin Netanyahu embraces Meir Dagan, the then-outgoing chief of the Mossad intelligence agency, in January 2011. Dagan is among former security chiefs who have recently criticized Netanyahu, saying he has exaggerated the urgency of the threat posed by Iran's nuclear program. Ronen Zvulun/AP hide caption

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Budding scientists, engineers and doctors lined up to try surgical robots from Intuitive Surgical at a science festival in Washington, D.C., over the weekend. Scott Hensley/NPR hide caption

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Teresa MacBain pauses while talking about her ongoing job search. She has been out of work since leaving her position as a Methodist pastor earlier this year. Colin Hackley for NPR hide caption

itoggle caption Colin Hackley for NPR

Chinese paramilitary police patrol outside the U.S. Embassy in Beijing on April 28. Chen Guangcheng, a blind legal activist who fled house arrest in his rural Chinese village, is reported to be under the protection of U.S. officials. Secretary of State Hillary Clinton is heading to China for what was supposed to be a routine visit. Alexander F. Yuan/AP hide caption

itoggle caption Alexander F. Yuan/AP

Bosnian Muslim women hold posters with the names of the missing during a protest at the U.N. office in Sarajevo in 2008. Hundreds of wartime rape victims were protesting the decision of the U.N. war crimes tribunal to reject the prosecution's request for rape charges to be added against two Bosnian Serbs who were on trial for other war crimes. Hidajet Delic/AP hide caption

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President Obama and former President Bill Clinton golf together in September 2011. The former president is campaigning for Obama, four years after the two men exchanged harsh words during the Democratic primary battle between Obama and then-Sen. Hillary Clinton. Chris Kleponis-Pool/Getty Images hide caption

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