Libyan rebels head to the front line on the outskirts of the eastern city of Ajdabiya on May 1. Saeed Khan/AFP/Getty Images hide caption

The Navy SEALs who stormed Osama bin Laden's compound in Abbotabad, Pakistan, on Monday spent much of their time collecting evidence that is now being pored over by U.S. intelligence officials. Getty Images hide caption

Neighbors look over the devastated Smithfield Estates neighborhood in North Birmingham, Ala. Tanya Ott for NPR hide caption

Jody Banks displays a selaginella plant at her desk at Purdue University. Banks says selaginella represents an important step in the evolution of plants and produces secondary metabolites that could have medical applications. Andy Jessop/The Purdue Exponent hide caption

Developer Sharif El-Gamal, pictured here last August, says working on the controversial New York mosque has been very hard. Frank Franklin II/AP hide caption

Pakistani Foreign Secretary Salman Bashir briefs the media about the killing of Osama bin Laden at the Foreign Ministry in Islamabad on May 5. Bashir said that the accusations that Pakistan's intelligence agency colludes with al-Qaida are false and cannot be substantiated. Farooq Naeem/AFP/Getty Images hide caption

A U.S. Border Patrol agent walks past photos of slain fellow agent Brian Terry, a Marine Corps veteran, during a memorial service on Jan. 21, 2011, in Tucson. Terry was killed during a Dec. 14 shootout near the U.S.-Mexico border. Thousands of Border Patrol agents and law enforcement officers from across Arizona turned out for the memorial. John Moore/Getty Images hide caption

Nurse Pamela Saenz draws blood from a student from the Instituto Tecnologico de Delicias at a mobile blood bank in the northern Mexican city of Delicias, Chihuahua. Monica Ortiz Uribe for NPR hide caption

Susan Watts (left) says that working with her mother, Elaine Hoffman Watts, is a "double-edged sword." Courtesy of the artist hide caption