know also that the ignorant man is taughtby ignorant parents , by ignorant friends , by ignorant books and ignorant magazines , by ignorant television and ignorant radio , by screeching internet ads , by ignorant billboards and banners , by leaflets and bulk mail , by phone campaigns and door-to-door salesmenis taught at every turn that there is nothing more to life than what he can see , touch , hear , smell , or taste .