About: http://webisa.webdatacommons.org/180663245

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	Photons are never at rest so it is impossible to measure their mass when they are at rest.
http://www.w3.org/ns/prov#wasQuotedFrom	abovetopsecret.com