About: http://webisa.webdatacommons.org/403575563

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	Potassium-40 is a naturally occurring isotope that is unstable and decays, but it has a huge half life, about a billion years.
http://www.w3.org/ns/prov#wasQuotedFrom	symmetrymagazine.org