<http://schema.org/description>
"There are many categories of mountain biking , each of which requires unique gears and technique. Several challenging mountain biking categories involve speed, agility and presence of mind. Take this quiz to learn more about this exciting new sport."^^<http://www.w3.org/2001/XMLSchema#string>
<http://adventure.howstuffworks.com/outdoor-activities/biking/mountain-biking-categories-quiz17.htm>