<http://schema.org/description>
"Satellites give a rough picture of the Earth\u2019s geoid. Now physicists say atomic clock technology  is ready to give a better picture from the ground"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.technologyreview.com/s/429238/atomic-clocks-to-measure-earths-geoid-from-the-ground/>