About: http://webisa.webdatacommons.org/284684119

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	Electromagnetic waves, such as light, andgravitational waves exhibit polarization; sound waves in a gas or liquid do not have polarization because the medium vibrates only along the direction in which the waves are travelling.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com