About: http://webisa.webdatacommons.org/440109823

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	The penny is a nod to field geologists' informal practice of placing a coin as a size reference in close-up photographs of rocks, and it gives the public a familiar object for perceiving size on Mars easily.
http://www.w3.org/ns/prov#wasQuotedFrom	nasa.gov