Handled radioactive materiales in the 1960's bare handed.Actually, one can handle reactor rods as new without any fear.My teaching partner,physics,and at one time-- MacArther's staff,not only did that, but armed several bombs and set them off.No glow in the dark,but my 1966 Rolex had to be returned as it emitted too much.My Dad in the 1940's would let me sit behind the flouroscope and watch a soda go down while I looked on in a mirror.Sears(the store) had the shoe flourescope and we would go there and move coins around with our toes while watching.Still have the toes and a foot fetish.If you still think that I have made a challenge,no.But,if you would like one,check with me.I can think of ones that are mental and physical and impossible.