George Hussein Obama, the youngest half-brother of President Obama, in Nairobi, Kenya. Stephen Morrison/epa/Corbis hide caption

itoggle caption Stephen Morrison/epa/Corbis

The fossil finger was found in a cave in the Altai Mountains of Siberia. Whoever that finger belonged to was neither human, like us, nor Neanderthal, the only other member of the human line known to be living in Europe at the time. Courtesy of Bence Viola hide caption

itoggle caption Courtesy of Bence Viola

Umar Farouk Abdulmutallab, here in Milan, Mich., was charged in federal court in December with trying to detonate an explosive device on a Dec. 25 flight from Amsterdam to Detroit. U.S. Marshals Service/AP hide caption

itoggle caption U.S. Marshals Service/AP

The religious school where Umar Farouk Abdulmutallab studied the Quran. The school was named after Abdulmutallab's grandparents and financed by his father, a respected and wealthy banker. Ofeibea Quist-Arcton/NPR hide caption

itoggle caption Ofeibea Quist-Arcton/NPR

An oil exploration tower is pictured in Tonya on the shore of Lake Albert on April 25, 2008. Walter Astrada/AFP/Getty Images hide caption

itoggle caption Walter Astrada/AFP/Getty Images