About: http://webisa.webdatacommons.org/396295085

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	If inside the box there is a charge, even a massless one, outside the box cannot be, in fact, vacuum, because of the electromagnetic field???s energy.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com