How could a person learn to fly without aids?

I mean literal flying like in Dragon Ball, where the characters can neutralize the gravitational structure on Earth and everywhere else through advanced Ki control. How could a similar or different concept be applied to real life? I've also thought about implementing a kind of jet propulsion system under the sole of the shoe that,…

If an electron is in superposition so that it is in two places at once, is the gravitational field also in two places?

If you have an electron in superposition, OK, you measure mass in two places, nothing crazy, but with a double slit? Do you then have to measure a gravitational wave? I mean, OK, an electron has almost no mass and it should be difficult to measure that, but take a molecule for all I care,…