About: http://webisa.webdatacommons.org/369348360

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	He says light is a wave and therefore> needs a medium, an d if it were one wave it would need a> medium, but light is two waves, one electric and one> magnetic.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org