About: http://webisa.webdatacommons.org/139502022

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	A piece of intensely magnetic magnetite... was used as an early form of magnetic compass [since] iron, steel and ordinary magnetite are attracted to a magnetic field, including the Earth's magnetic field.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com