[FrozenVoid]

> anything

Perpetual motion machine to provide infinite electricity. Perhaps it could use some loophole to harvest background energy or tap into another dimension where energy is abudant. Effects: With infinite electricity machines, fossil fuels and distribution system become obsolete, all technological processes are now thousands of times cheaper and tranportation becomes free. All products/foods/tools now can be autonomously created(think space colonies), limited only by raw resources. Agriculture is replaced by decentralized vertical farms and robots. Factories switch to automated production, fueled by free electricity. Robots can run forever, all device will have permanent electricity supply. All problems with pollution/warming/etc start to disappear as energy usage switched to free electricity.

[ChrisGranger]

I fear that your perpetual motion machine would be promptly weaponized. I'm not sure what that would look like, but this seems to be human nature...