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Top 10 Incredible SciFi Technologies That Already Exist
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A perpetual motion machine is a machine that, once it’s started, won’t stop and doesn’t need any additional energy to keep going. That means the machine could be used as a source of unlimited free energy. Which is great, so why don’t we just make one? Well, it isn’t because of some conspiracy theory by the energy sector. The reason none have ever been built is because they’re actually impossible to build since perpetual motion breaks the first two laws of thermodynamics. The first law is that energy is constant; it cannot be created or destroyed. The second is that entropy will either increase or remain the same. Essentially, you can never get a greater output of energy than inputted and energy will always decrease over time.

Text version: http://www.toptenz.net/10fascinating...

Coming up:

10. Boyle’s SelfFlowing Flask
9. Monopole Magnet
8. Rolling Ball Wheel
7. Water Mill and Pump
6. Paul Scheerbart’s WeightDriven Cogwheel
5. Magnets and Gravity
4. Force of Gravity Perpetual Motion Machine
3. Neodymium Magnets
2. Perepiteia
1. Finsrud’s Perpetuum Mobile

Source/Further reading:

   • Robert Boyle' Flask  
   • Easy to make free energy, perpetual m...  
http://phys.org/news/201401physicis...
https://www.youtube.com/results?searc...
http://www.alibaba.com/showroom/monop...
   • Perpetuum Mobile || Perpetual Useless  
http://www.jstor.org/stable/3102281?s...
http://www.marcdatabase.com/~lemur/gr...
   • Perpetual motion water wheel  
https://books.google.ca/books?id=sNG6...
   • Perpetual Motion Machine of Paul Sche...  
http://www.veproject1.org/index.php/d...
http://wakefieldpress.com/scheerbart_...
   • Magnetism & Gravity. Perpetual motion...  
   • Perpetuum motion machine with an oppo...  
http://www.wired.com/2012/11/ananaly...
   • Máquina de Movimiento Perpetuo  Ener...  
http://www.wisegeek.org/whatareneod...
   • PEREPITEIA GENERATOR DEMO VIDEO  Par...  
   • Video