Just made this little doohickey (watch on YouTube for HD):
Was just browsing videos when I came across gamefreak1756’s video. I’ll admit at first glance I thought it was a hoax, then realized it was real. I had the parts within arms reach, so put it together in about 10min. There’s a nice little wikipedia article on homopolar motors, and many more examples out there, like this multi-axis model. It’s a fun easy little experiment to do with the kids.
Techie bonus points: I recorded this on my electronics desk in front of a few micro boards I’ve been playing with. Can you identify them?