Casey Riffe/The Gazette via AP
Del Kranzler walks Firdavs Temirov, an exchange student from Tajikistan, to the bus stop near their Plentywood, Mont. home on Nov. 18, 2010. For some foreign-exchange students, a year at an American high school opens up new opportunities. For Temirov, it's given him a new leg, an artificial limb emblazoned with the stars and stripes of the American flag.