A flight attendant prepares to close a luggage bin on the redesigned 737. Thanks to the bin's new pivoting motion, passengers in the aisle seat will have more headroom. American Airlines hide caption

itoggle caption American Airlines

A student works on her robot gladiator. Courtesy of National Tooling and Machining Association hide caption

itoggle caption Courtesy of National Tooling and Machining Association

Marijuana buds for sale at the Sunset Junction medical marijuana dispensary in Los Angeles, Calif. Kevork Djansezian/Getty Images hide caption

itoggle caption Kevork Djansezian/Getty Images

LinkedIn CEO Jeff Weiner, center right with beard, and Reid Hoffman, center background with glasses, listen to traders during their company's listing on May 19 on the New York Stock Exchange. The company reached a market value of $9 billion last week, leading to fears of another dot-com bubble. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP