U.S. Army Sgt. Don Stolle launches a Raven surveillance drone from Achin, Afghanistan, on Aug. 30. The drones have been widely used in Afghanistan, Pakistan and Iraq, and now the military plans to employ them in other areas as it tracks suspected terrorists. John Moore/Getty Images hide caption

U.S. Air Force F-16 jet fighters sit on the tarmac at Aviano Air Base in Italy in March. The Air Force tested its jets on fuel made of 50 percent vegetable oil. Giuseppe Cacace/AFP/Getty Images hide caption

Manuel Martinez, the manager of a popular salad restaurant in Washington, D.C., called Sweetgreen, assists a customer. Martinez says customers use the QR code on the wall to learn about promotions and to get discounts. Mallory Benedict/NPR hide caption

Workers clear the wreckage of a July 23 high-speed-train collision in Wenzhou in eastern China's Zhejiang province. The crash killed 40 people and raised questions about the safety of the country's high-speed-rail network, which the Chinese government has held up as an example of its technological prowess and with which it had hoped to attract overseas buyers. STR/AFP/Getty Images hide caption

Lemongrass stalks, when finely chopped, add a unique citrusy note to Thai cuisine. iStockphoto.com hide caption

Public workers march with a banner that reads in Spanish "More jobs, zero layoffs" in San Juan on Oct. 15, 2009. Thousands of protesters gathered at Puerto Rico's financial hub to demonstrate against Gov. Luis Fortuno and the layoffs of more than 20,000 public employees. Ricardo Arduengo/AP hide caption

Afghans carry the coffin of Afghanistan High Peace Council head and former President Burhanuddin Rabbani during his burial ceremony in Kabul, Sept. 23. A suicide bomber assassinated Rabbani on Sept. 20, which further complicates the thorny issue of negotiating with the Taliban. Ahmad Masood/AFP/Getty Images hide caption

Wilco, from left: Mikael Jorgensen, Glenn Kotche, Patrick Sansone, Jeff Tweedy, John Stirratt, Nels Cline. Zoran Orlic hide caption