<http://schema.org/description>
"The Dawn of Flight Timeline detailing the early history of the aviation industry. Follow the development of flight from 400 B.C. to the historic flight at Kitty Hawk. Learn more about the dawn of flight timeline."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/transport/flight/classic/dawn-of-flight-timeline2.htm>