If I had a superpower, what would it be and how would I use it?
That's easy. I would be a Cancer Zapper.
I would whisper in the patient's ear, "Tell that doc he/she is mistaken. You don't have cancer!"
Then I would fly off to the next patient, and the next, and the next.
Until no one, anywhere, ever had to hear those words again. Now that would be pretty super, wouldn't it?