<http://schema.org/about>
"NASA first noticed a leak in this same cooling loop in 2007, but the rate of ammonia loss was so low back then that immediate action was not required."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/serious-coolant-leak-on-space-station-has-a-history>