"[A]n electric machine... first produced by ... is based on... attractor forces. ...[I]f you take a lump of sulfur and... rub it with a silk cloth... it will start to pick up bits of paper... hair... feather... [A]nother mineral... [Latin electrum]... had the same property. ...Otto von Guericke made a special globe out of sulfur ...and he described the remarkable reactions of things being ...attracted to it ...[I]t was the birth of ..."