Wireless power transmission and things like Tesla coils are basically magic to my brain. I "know" how they work, but seeing it happen is kind of amazing. Our little home made Tesla coil was one of our most popular gadgets we built. I should build a more reliable one... we live in a dry place now.

You would enjoy Styropyro if you haven't found his YT channel yet: https://www.youtube.com/watch?v=6TgrtA2wKaM