About: http://webisa.webdatacommons.org/309133500

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	They can change speed, direction and height in seconds???..The best thing is if there are multiple witnesses to the sighting.
http://www.w3.org/ns/prov#wasQuotedFrom	ufo-blog.com