Don't laugh. PMMs work! I built mine ten years ago when I realised I could improve the SOTA by a huge 20%. I've been improving it for the last 10 years and I get an average performance boost of ~0.25 every year. We will have Free Energy in the next 10 years.

Cool! Mine passively extracts unlimited energy from the expansion of space.

Not scientifically perpetual. But definitely, relative to the finite future lifetime of the human race, operable for perpetuity.

And by extracting dark energy, we can not only turn the big rip around. But by pulling dark energy out of space in a linear direction ahead of a ship, we can power the ship to high speed, as we contract space in front of the ship. Like fusion, we can use extracted dark energy to extract more dark energy. Essentially smoothly teleporting forward. No more fundamental speed limits relative to observers at distance. Looking forward to exploring beyond the observable universe.

It isn't "free" though. There are unique risks.

I find your comment interesting, even though I'm not sure if I really get what you're saying. You built a perpetual motion machine? You then made improvements? Can you share details?

The trick is you use magnets, momentum, and WD-40. That can get you most of the way.

It probably will eventually stop, though. Something about the Sun becoming a red giant...

20%? 0.25%? Those are rookie numbers! /s

(I feel like this post is underappreciated by at least 20%. :D )