About: http://webisa.webdatacommons.org/167751534

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	But in general relativity spacetime is curved; it is therefore conceivable that a timelike curve can loop back and intersect itself in the past, in a kind of time machine.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com