About: http://webisa.webdatacommons.org/401773035

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	Why were the cavities made from niobium when they could have been made from a less expensive metal, such as copper?
http://www.w3.org/ns/prov#wasQuotedFrom	jlab.org