<http://schema.org/about>
"Even if the risk of Earth being hit by a big asteroid in the near future is relatively small, the impact could be so devastating that it is worth making sure it doesn't happen."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/neoshield-assess-earth-defence-against-asteroids.html>