Perpetual motion machines don't exist but..............

I believe the efforts to attain perpetual motion has been a boon to science. Perpetual motion fails because it violates the laws of motion and friction. Here are a few interesting attempts at perpetual motion.

https://youtu.be/6NG6Y5aKN0w

I wonder if a counter balanced wheel in the vacuum of space could be a perpetual machine?

via International Skeptics Forum https://ift.tt/3bvnFnX