The Ash Grove Cement Kiln, as seen from an aerial photograph, sits on the northern edge of Chanute, Kan. David Gilkey/NPR hide caption

A Saudi woman drives a car in Riyadh in June as part of a campaign to defy the kingdom's ban on women driving. The image is from a video released by Change.org. AP hide caption

A new SipSmart kiosk awaits customers at Caputi's, a sports bar in suburban Buffalo, N.Y. Customers swipe a credit card and then blow into a plastic mouthpiece attached to the side of the machine. Seconds later, their blood-alcohol level flashes on the screen. Daniel Robison for NPR hide caption

GOP presidential candidates (from left) former Pennsylvania Sen. Rick Santorum, Rep. Michele Bachmann, former House Speaker Newt Gingrich, former Massachusetts Gov. Mitt Romney, businessman Herman Cain, Texas Gov. Rick Perry, Rep. Ron Paul, and former Utah Gov. Jon Huntsman, pose before a GOP presidential debate at Oakland University in Auburn Hills, Mich., on Wednesday. Paul Sancya/AP hide caption

In 1962, President John Kennedy (center) and Vice President Lyndon Johnson visited Dr. Wernher von Braun (left), who designed the Saturn rocket in Huntsville, Ala. AP hide caption

American astronomer Edwin Hubble looks through the eyepiece of the 100-inch telescope at the Mount Wilson Observatory in Los Angeles, 1937. In 1929, Hubble proposed that the more distant a galaxy is, the faster it appears to be receding from us, a concept that has become known as Hubble's law. Margaret Bourke-White/Time & Life Pictures/Getty Images hide caption