<http://schema.org/description>
"Absence can speak volumes. The lack of sediment in a flat piece of ground\u2014a track\u2014can testify to the footstep of a dinosaur that once walked on it. The lack of minerals in a solid shell\u2014a hole\u2014can reveal the presence of parasite that was once trapped in it. The world\u2019s museums are full of such \u201Ctrace&amp;hellip;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://phenomena.nationalgeographic.com/2012/11/20/wormholes-in-old-books-preserve-a-history-of-insects/>