Gentex Corp.'s rearview mirror camera display enables drivers to see objects and people behind the vehicle using a tiny camera mounted to the back of the car. Courtesy of Gentex Corp. hide caption

itoggle caption Courtesy of Gentex Corp.

A Somali girl in Mogadishu. The city was once a beautiful, seaside tourist town, but two decades of civil war has left it in ruins. Frank Langfitt /NPR hide caption

itoggle caption Frank Langfitt /NPR

Frank Buckles during a 2008 ceremony honoring him on Capitol Hill in Washington, D.C. Karen Bleier/AFP/Getty Images hide caption

itoggle caption Karen Bleier/AFP/Getty Images

The sun gleamed down on the closed Washington Monument as the federal budget impasse continued in Washington on Jan. 4, 1996. Brawling and bargaining by turns, President Clinton and Republican congressional leaders struggled to make progress toward a balanced budget, while blaming each other for a partial government shutdown that inconvenienced millions. Dennis Cook/AP hide caption

itoggle caption Dennis Cook/AP