Perpetual Motion Machines of all times.
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Ok so here is the thing about perpetual motion machines. they cant work. the first 2 laws of thermodynamics eliminates every single machine that can be constructed on this earth. you cant get energy out of nothing, you cant maintain energy out of nothing. that means that anything with moving parts is making a small amount of friction and therefore heat and energy. all of your machines have no way of working forever and ever and ever. it literally isnt possible.
And before you make the bullshit argument of "the planet is constantly in motion" well yes but that is literally on the scale of planets, how in the everliving fuck is that useful to the human race? planets move through the massive gravitational pull of something bigger, this doesnt work very well on the surface of said planet because everything is fucking tiny and has a tiny tiny tiny gravitational pull.