Maybe there's americium in the Buds to detect smoke coming out of one's ears? Or maybe they are painted with radium so that you can find them in the dark?
The one that causes pain in ears.
Are you talking about pain that radiates out of your ears?
"Overall, extremely low frequency magnetic fields were evaluated as possibly carcinogenic to humans (Group 2B)."
What about the (again, non-ionising) EMF coming from the cords in your wired headphones?
Sometimes a little knowledge is a dangerous thing...