These are 40 working models of Perpetual Motion Machines made in 4 years. Not all of them are perfect, but they are still the part of the history of the world engineering. The mankind is looking for free energy for 1000 years resulting of discovery three Laws of Thermodynamics stated that perpetual motion is impossible. Easy Jam by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100245 Artist: http://incompetech.com/