<http://schema.org/about>
"The first-ever in-depth analysis of Martian dirt reveals a mineralogical makeup similar to that of Hawaiian volcanic soils, researchers announced on Oct. 30."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/space/stories/mars-dirt-similar-to-soil-on-hawaii>