About: http://webisa.webdatacommons.org/83120837

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	But, lacking any measure other than the survey of their real effect on learning, the publishers (or teachers) generally would toss out the more effective videos in favor of the less effective ones.
http://www.w3.org/ns/prov#wasQuotedFrom	mfeldstein.com