About: http://webisa.webdatacommons.org/188607497

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	However, building portable electric power sources of sufficient energy capacity is a problem.
http://www.w3.org/ns/prov#wasQuotedFrom	reference.com