<http://schema.org/description>
"Some of the brightest minds in history have focused their intellects on the subject of light. Einstein even tried to imagine riding on a beam of light. We won&amp;#039;t get that crazy, but we will shine a light on everything scientists have found so far."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/light3.htm/printable>