<http://schema.org/description>
"Modern UFO history began with the 1947 UFO sighting by pilot Kenneth Arnold. But the roots of UFO stories stretch back to ancient and medieval days. Learn about the history of UFOs and strange phenomena from ancient times to the mid-20th century."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/space/aliens-ufos/ufo-history5.htm>