About: http://webisa.webdatacommons.org/239157355

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	In the case of an electromagnetic wave such as light, for example, a completely dark room does not mean that there are no electric and magnetic fields, as one might naively assume.
http://www.w3.org/ns/prov#wasQuotedFrom	fqxi.org