About: http://webisa.webdatacommons.org/391176163

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	Crystals such as galena and pyrite were used as detectors when radio first started.
http://www.w3.org/ns/prov#wasQuotedFrom	connected-earth.com