<http://schema.org/about>
"The egg is expected to fetch up to $45,000 when it is sold in Christie's \"Travel, Science and Natural History\" sale in April."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/animals/stories/massive-egg-of-extinct-flightless-bird-up-for-auction-photo>