Ahmed Wali Karzai, shown here in October 2009 during an interview with The Associated Press in Kandahar, is battling allegations that he has participated in illegally taking possession of land and water rights in the southern Afghan province. The theft of both private and public lands is a growing problem in Afghanistan. Allauddin Khan/AP hide caption

itoggle caption Allauddin Khan/AP

Geek Group founder Chris Boden (right) works with Michael Borzkowski on what they hope will be the world's largest Newton's Cradle — perhaps better known in smaller form as the desktop toy known as balance balls. Lis Bokt/The Geek Group hide caption

itoggle caption Lis Bokt/The Geek Group

Trucks carrying goods from Iran to Iraq queue for inspection about 90 miles from the southeastern Iraqi city of Amara. These days, Iraqi truckers face more delays than mortal danger while working, but life remains a challenge. Essam al-Sudani/AFP/Getty Images hide caption

itoggle caption Essam al-Sudani/AFP/Getty Images

Employee Raul Quecada places a "No Sale" sign on a used Toyota vehicle at a Toyota dealership in Alhambra, Calif., on Jan. 27, one day after Toyota Motor Corp. announced it would halt sales of some of its top-selling models to fix gas pedals that could stick and cause unintended acceleration. Nick Ut/AP hide caption

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Coronal loops, seen here, are fountains of multimillion-degree gas in the atmosphere of the sun. They are often precursors to solar flares, which emit strong bursts of electromagnetic energy. NASA/AP hide caption

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Women struggle to carry 55-pound bags of rice given out Sunday in Port-au-Prince. David Schaper/NPR hide caption

itoggle caption David Schaper/NPR

The four original participants in the Woolworth's lunch counter sit-in walk down the street after leaving the lunch counter on Feb. 1, 1960. The Woolworth's sit-ins continued for months and inspired sit-ins across the country, which helped change public opinion and led to the end of segregation. Jack Moebes/Corbis hide caption

itoggle caption Jack Moebes/Corbis