About: http://webisa.webdatacommons.org/451208101

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	One must remember that if one looks directly into a refracting medium, i.e. perpendicular to the surface, the angles are accurate, but if one looks off the normal, the angles are distorted.
http://www.w3.org/ns/prov#wasQuotedFrom	sciencebuddies.org