^* And in the paper “Voluntary Tolerance of the Human to Impact Accelerations of the Head.” Eleven subjects, at least one of them dressed in a suit and tie, received blows to the head with 9-and 13-pound pendulums. As the authors put it: “Considerable distortion of the face was observed as the bony structure of the head was accelerated away from the softer portions.” We owe these men a debt of thanks. In the early investigations of head impact, a cadaver was of limited help. You couldn’t ask him to count backward by sevens or name the president, and you’d never know what sort of headache he had.