Don’t know about the hovering coin but if they all create a negative magnetic field I can see it being plausible, can’t say I have my head around that one though.

However the batteries and the coil (not just a tube) is just how you make a magnet from a battery at all. So the metal on the end of the battery is giving contact to the coil, and the positive and negative at each end is causing the energy to travel through the coil from the front of the battery to the back, but the magnetic field created pushes it through the inside of the coil, making the contacts move, etc.

It’s basically an electric engine but inside out sort of. That’s also why I’m unsure on the spoons. Everything else is legit and some of them I’ve actually done myself like the flame down the smoke line, made a battery out of a potato once, made some magnets the manual way, etc… now I kinda want to try it, lol