About: http://webisa.webdatacommons.org/121619066

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	Gravity is the weakest of the four forces known to modern day physics, and that makes it very hard to study.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com