About: http://webisa.webdatacommons.org/154140252

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Tracking two points moving in opposite directions, or in a circle, is a little trickier.
http://www.w3.org/ns/prov#wasQuotedFrom	arstechnica.com