About: http://webisa.webdatacommons.org/248057079

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	At 52 pages, the chapter on gravitational mass is the longest and the most interesting in the book.
http://www.w3.org/ns/prov#wasQuotedFrom	americanscientist.org