People travelling through Philadelphia International Airport Terminal A West Transit Corridor. The airport is the 12th busiest in the world. iStockphoto hide caption

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Oregon Sen. Ron Wyden, a Democrat, (left) and House Budget Committee Chairman Paul Ryan, a Wisconsin Republican, present their plan for changing Medicare at the U.S. Capitol Thursday. Tom Williams/Roll Call/Getty Images hide caption

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Chinonye Omeje (center) says she would like to become a nurse. Courtesy Of Perkins School For The Blind hide caption

itoggle caption Courtesy Of Perkins School For The Blind

Army flight medics work on a Marine who was wounded by an improvised explosive device, or IED, in southern Afghanistan.

Kevin Frayer/AP hide caption

itoggle caption Kevin Frayer/AP