The motivation behind the strongly humanoid design is the embodied cognition hypothesis, that human-like manipulation plays a vital role in the development of human cognition. A baby learns many cognitive skills by interacting with its environment and other humans using its limbs and senses, and consequently its internal model of the world is largely determined by the form of the human body. The robot was designed to test this hypothesis by allowing cognitive learning scenarios to be acted out by an accurate reproduction of the perceptual system and articulation of a small child so that it could interact with the world in the same way that such a child does. 
Supersonic. Double-sonic. Triple-sonic. Flying
Wing. Swing Wings....
The five aircraft in this booklet, the USAF’s first research-dedicated experimental aircraft or X-planes, were configuration explorers which charted new domains of flight and broke new ground in aeronautical science. There were accidents, injuries and deaths, but every aircraft flying today has benefited from these X-planes.
A summary of each program is included, along with picture and biography of main project pilots: Jack Woolams, Robert Stanley, Glen Edwards, Chalmers Goodlin, Chuck Yeager, Arthur Murray, Frank Everest, Iven Kincheloe, Milburn Apt, William Bridgeman, Joseph Walker, Chuck Tucker, Scott Crossfield, Jean Ziegler, Raymond Popson.