what do you think of free energy, I think its crap, but please prove me wrong, environmental variables excluded, like alternative energy, like solar panels and wind and tidal and stuff like and nuclear plants, we all know that works 
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Tesla discovered cold electricity: "Electrical energy is like a waterfall which can be tapped from any point in space. It behaves like an incompressible fluid."
Cold electricity was rediscovered by a one Mr. Gray in the 60's. Since then they tried to research it, but robust methods of reproducing the experiments of Tesla still eludes us.
There are many exotic energy effects known to researchers, but I think that cold electricity is the future of power technology. Full development and support of cold electricity technology will be cause for the greatest progression in technology ever seen.
I think that in 80-100 years one of the exotic energy extraction methods will be developed to a global usage level. Tesla, one of the greatest minds, was convinced that energy is freely and abundantly available anywhere.
You can laugh and think what you will, but we will all be in for some amazing surprises.
The very popular Bedini motor displays this reversed behavior as well, and you can build one yourself. With a Bedini motor you can revive dead lead-acid batteries to work better than ever before. You can also extract copious amounts of hydrogen from normal water without a catalyst by using Tesla's high frequency methods.
I have built a Bedini motor, here is a pic of mine: http://mybroadband.co.za/photos/showphoto.php?photo=6650&cat=500. He calls it radiant energy but I think it's the same as cold energy. My motor did revive a few dead batteries so I can vouch for that. It appears to be extremely efficient but I still need to get more equipment and find the time to do further experiments.