About: http://webisa.webdatacommons.org/214807995

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	The quanity of light reaching the photocell is a function of the optical density of the finger which in turn is a function of the quantity of blood in the arteries of the finger at the distal end.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com