About: http://webisa.webdatacommons.org/122731365

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	Radioactivity was discovered in 1895, when it was found that heavy elements such as uranium emitted rays" which could ionize air and fog photographic film.
http://www.w3.org/ns/prov#wasQuotedFrom	nasa.gov