<http://schema.org/description>
"Some 41,000 years ago a complete reversal of the Earth's magnetic field occurred and compass needles would have pointed south not north, German scientists say."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2012/10/16/Flip-flop-of-Earths-magnetic-field-probed/UPI-20911350433864/>