shale oil
... that shale oil was used to light the streets of Modena, Italy, at the turn of the 17th century?
... that <b id="mwDrc"><a href="./Shale_oil" id="mwDrg" rel="mw:WikiLink" title="Shale oil">shale oil</a></b> was used to light the streets of <a href="./Modena" id="mwDrk" rel="mw:WikiLink" title="Modena">Modena</a>, <a href="./Italy" id="mwDro" rel="mw:WikiLink" title="Italy">Italy</a>, at the turn of the 17th century?