About: http://webisa.webdatacommons.org/258416864

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	Diamond is the hardest material known, because its carbon atoms form very short covalent bonds, according to co-author Richard B. Kaner, UCLA professor of inorganic chemistry and materials science and engineering.
http://www.w3.org/ns/prov#wasQuotedFrom	phys.org