which scientist is known for the quintessence and the quintessence ?
select distinct var_uri where brack_open var_uri dbo_knownFor dbr_Quintessence_ attr_open physics attr_close sep_dot var_uri rdf_type dbo_Scientist sep_dot var_uri dbo_knownFor dbr_Quintessence_ attr_open physics attr_close sep_dot brack_close