MS of laboratory technician adjusting controls on complex equipment of pumps, pipes and glass tubes. ECU of lighted electrodes in light bulb, electrodes then going off. CU of device holding block of material, working up and down to shear material off in thin layers; hand is seen removing layered material. HAS of laboratory technician pouring nitrate over dead rat, hard frozen rat is shaken off of excess liquid, then put on table beside dissecting instruments.