Honda's CNG Civic is the only natural gas-fueled sedan currently available in the United States. With so few CNG passenger cars on the road, pumping stations are few and far between.
Tracy Samilton for NPR
Who's The Happiest? Researchers studied photos of Olympic medalists to learn who is the happiest. Here, bronze medalist Aliya Mustafina of Russia, gold medalist Gabby Douglas of the U.S., and silver medalist Victoria Komova of Russia pose after the all-around gymnastics final.
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Members of the Free Syrian Army are seen in a neighborhood of Damascus, Syria on June 28. Several huge suicide bombings this year suggest al-Qaida or other extremists are joining the battle against President Bashar Assad's regime.