<http://schema.org/description>
"We are a species of bridge builders. Since time out of mind, humans have engineered structures to vault over obstacles with the help of logs, stone, steel and, of course, ingenuity. So, what keeps our bridges steadfast and strong?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/engineering/civil/bridge9.htm>