That little box on Star Trek that they just wave it over a person’s body and it cures them of their illness.
Any form of effective immortality. Even if it’s just brain-in-a-jar.
Reverse balding. My friend (26) only has hair on the side and the back of his head. I’m still going strong, I have some hair even on the top of my head in an elegant V-shape.
Now that I think of it, my father (64) has more hair than my brother, my friend, and I combined.
I want to be able to see UV and infrared light. Not only could I see heat but I could also see energy flying out of electronics.
Cure for cancer