Texas-based Valero Energy -- which owns gas stations across the country, like this one in Sacramento,Calif. -- has contributed about half of the roughly $10 million behind California's Proposition 23 campaign. Rich Pedroncelli/AP hide caption

Tests of cholera samples from Haiti suggest the strain behind the outbreak came from South Asia. Lawrence Livermore National Laboratory hide caption

The Food and Drug Administration has approved Nuedexta to treat a condition known as emotional incontinence. Courtesy of Avanir hide caption

Russia's Volga River travels 2,300 miles through the country's heartland. It is the source of Russia's power, spanning from imperial times to the present. Here, a cruise ship travels down the Moscow-Volga canal, heading into the river. Anne Garrels/NPR hide caption

The Brightest Bulbs? In Chris Morris' blistering satire Four Lions, militants Barry (Nigel Lindsay, left), Waj (Kayvan Novak), and Hassan (Arsher Ali) prove to be about as cunning as the Three Stooges. Drafthouse Films hide caption