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Air Force One, Interior. President Barack Obama with Interior Secretary Ken Salazar on Air Force One in February 2009.

A helicopter from the HMX-1 "Nighthawks" squadron comes in for a practice landing on the South Lawn of the White House, March 30, 2012.

An MV-22 Osprey maneuvers on the flight deck of the aircraft carrier USS George H.W. Bush (CVN 77) during test operations.

World War I in Photos: Technology

WW 1: American troops using a newly-developed acoustic locator, mounted on a wheeled platform. (National Archives)

Ernest Shackleton's ship caught in the Antarctic ice ...Raymond Priestley said, "Scott for scientific method, Amundsen for speed and efficiency but when disaster strikes and all hope is gone, get down on your knees and pray for Shackleton."