The world's largest electromagnet, at the University of California, produced a greenish-blue ray of positively charged particles which we proclaimed to be "the most powerful beam of radiation ever produced by man." It was so dangerous that "a finger placed in this ray for only an instant would be lost."
Sounds like your typical doomsday scenario, or just another day at Doofenshmirtz Evil Inc
, but these researchers chose to look at the positive and found through experiments that it could be more effective at attacking cancer cells than both radium and x-rays:
"Here, it would seem, is the nearest thing science has ever produced to a 'death ray' that can be projected through the air on a mission of destruction. Yet its creators hope, when they have learned to control its terrific power, to turn it into a veritable ray of life."
Read the full story in Deadly Magnetic Rays Harnessed for War on Cancer