About: http://webisa.webdatacommons.org/438659696

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	Light slows down when it enters a medium such as glass or water, and its new speed depends on the material.
http://www.w3.org/ns/prov#wasQuotedFrom	physicscentral.com