JetPack Man flies through the air at the NASCAR Sprint Cup Series AAA Texas 500 at Texas Motor Speedway on Nov. 6, 2011, in Fort Worth. Backers of a new $2 million competition hope to encourage the development of personal flying vehicles.
Jerry Markland/Getty Images for NASCAR
Passengers check in for flights with United Airlines at Chicago O'Hare International Airport. United, American and Delta now offer no-frills "basic economy" fares.
Scott Olson/Getty Images
Ready, set, fly! The ball bearings glued to this bumblebee's legs simulate the weight and placement of pollen loads. The tag on the insect's back is a lightweight sensor, designed to track its movements in flight.
Courtesy of Andrew Mountcastle