<http://webisa.webdatacommons.org/prov/203132729> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/359993931> . <http://webisa.webdatacommons.org/359993931> <http://www.w3.org/ns/prov#wasQuotedFrom> <laesieworks.com> . <http://webisa.webdatacommons.org/359993931> <http://www.w3.org/ns/prov#value> "He also proposed that waves of electromagnetic energy could travel through space at the speed of light, and that light is a form of electromagnetic radiation." . <http://webisa.webdatacommons.org/359993931> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .