<http://webisa.webdatacommons.org/prov/329252716>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/63036800> .
<http://webisa.webdatacommons.org/63036800>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/296295927>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/63036800> .
<http://webisa.webdatacommons.org/63036800>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<kurzweilai.net> .
<http://webisa.webdatacommons.org/63036800>	<http://www.w3.org/ns/prov#value>	"Naturally occurring materials such as air or water have a positive refractive index." .