Sgt. Kyle Gonzales, a sniper with the 82nd Airborne, has a cigarette after a gun battle near the village of Babaker, Giro district, Ghazni province. The soldiers have engaged in gun battles every time they push into the hamlets north of their forward operating base. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

An image from a demo of the Stuck on Earth app, which Lauren Goode of All Things D calls "a photographer's dream." Stuck on Earth hide caption

itoggle caption Stuck on Earth

A view of Earth, with shading to enhance features. Only 10 contestants remain in the 2012 National Geographic Bee. NASA hide caption

itoggle caption NASA

A month after Katy McCaffrey's iPhone was stolen, photographs began streaming from the phone to her "cloud" account. She used them to create a photo album on Facebook; she called it "Stolen iPhone Adventures." Facebook hide caption

itoggle caption Facebook

A row of taps highlights specialty and imported beers at Brouwerij Lane, in Brooklyn, New York. Craft brewers have found a way to thrive, even as the U.S. economy struggles. Bill Chappell/NPR hide caption

itoggle caption Bill Chappell/NPR

A cyclist rides on a bike lane on Prospect Park West, in the Brooklyn borough of New York City. Bike lanes of this type use parked cars to create a buffer zone from road traffic. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

Jennifer Drake and her daughter, Alex, pause before their morning ride. "My daughter and I bike to school (her work) 3 miles roundtrip daily," Drake writes. @JennLDrake hide caption

itoggle caption @JennLDrake

Three men stand with their penny farthing bicycles. Follow their example for Bike to Work Day, and take a photo of yourself and your bike. Then, post the photo to Twitter or Instagram, with the hashtag #NPRbike. Hulton Archive/Getty Images hide caption

itoggle caption Hulton Archive/Getty Images

Evelyn "Mama Bird" Johnson poses by at the airport she managed in Morristown, Tenn., in this 2005 file photo. Johnson, who began flying in 1944, died Thursday. Wade Payne/AP hide caption

itoggle caption Wade Payne/AP

The calico lobster known as Calvin is shown in this photo provided by Boston's New England Aquarium. The lobster is dark with bright orange and yellow spots. Tony LaCasse/New England Aquarium hide caption

itoggle caption Tony LaCasse/New England Aquarium

A mosaic of images taken in January 2012 shows Opportunity's vista north (left) and northeast (right), in an outcrop known as "Greeley Haven," where the rover spent its fifth Martian winter. The image released by NASA is presented in "false color," to make differences in the landscape easier to see. NASA hide caption

itoggle caption NASA

Many track fans watched online four years ago, as sprinter Usain Bolt set a world record at the Beijing Olympics. This year, NBC will stream video of all 302 events online. And Bolt, seen here showing his appreciation for video in 2010, will try to repeat his feat. Mark Dadswell/Getty Images hide caption

itoggle caption Mark Dadswell/Getty Images