1# Tesla coil and the radio and the Tesla coil was make wireless energy
3# Because he did not want to go out of business AC could go at a long distance when DC went from one place to the next to the next to get to the destination and AC was stronger.AC went back and fourth when DC just went forward.
4# Mark Twane and now famous his pigeon
5# wasteful
6# they guy who would flip a switch and electricity because Nikola Tesla pretty much invented electricity.