This may have been posted somewhere before, but I just noticed if you keep dropping a person on a skeleton over & over without picking it up they improve in healing & become master healers really quick. Before you say it I know it isn't right, but hey it works. Same thing for master builder take one guy to clear the blockage, as soon as he picks up a rock have him drop it. It doesn't clear the blockage any faster but gets them to master a whole lot quicker.