About: http://webisa.webdatacommons.org/270989197

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	we can solve the equation for hydrogen, but not for helium or other elements
http://www.w3.org/ns/prov#wasQuotedFrom	shodor.org