About: http://webisa.webdatacommons.org/85809267

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	That is, while the knots might form all kinds of shapes, if you were following the rope formed by the vortex ring, it would never touch itself.
http://www.w3.org/ns/prov#wasQuotedFrom	mnn.com