A biology professor I knew long ago had done a summer internship at a physics lab on Long Island. She said that some of the physicists would align the particle

A biology professor I knew long ago had done a summer internship at a physics lab on Long Island. She said that some of the physicists would align the particle beam from a cyclotron by placing an eye behind the target and waiting for the retina to fluoresce. She later heard that some of them developed cataracts earlier than one usually does.