About: http://webisa.webdatacommons.org/175864853

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	A black swan, or an unknown unknown, is an event that is not just unlikely, no one has ever seen or consider it before.
http://www.w3.org/ns/prov#wasQuotedFrom	paperplanes.de