<http://schema.org/description>
"When an actor dangles over an incredibly deep river gorge, blue screen photography is the magic that makes it look so real to the gasping audience. Find out how the blue screen technique works and why it&amp;#039;s so convincing on the big screen."^^<http://www.w3.org/2001/XMLSchema#string>
<http://entertainment.howstuffworks.com/blue-screen1.htm>