John Seawright, B.S.We’ve all seen it; the vicious collision that leaves a football wide receiver writhing in apparent pain; his strenuous, assisted walk to the locker room; and his eventual return to rejoin his team on the sideline with the accompanying statement from the sideline reporter, “The x-rays are negative.” X-rays are a form of high energy, ionizing radiation with a wave frequency much smaller than visible light on the electromagnetic spectrum. A medically ...