1 bed of nails. 1 professor. 1 smaller bed of nails. 1 30-lb concrete block. 1 face shield. 1 sledgehammer. And 1 determined teaching assistant with a mean swing. #PHYS1303 https://twitter.com/drsekula/status/981301618363846656/photo/1 https://chirp.cooleysekula.net/attachment/49552