I've pondered this since a teen, let me ask you fellas
If there is no such thing as free energy, why don't magnets expend themselves naturally? If you can set a magnet next to another magnet and have them move, what's stopping someone from making a magnetic "water wheel" where the negative pole (the water) is driving a positive pole on an axis (the wheel) , therefore giving limitless energy to something like a light bulb?
Natural magnets are clearly strong enough to overcome friction and gravity on something like a table, so why hasn't this been harnessed?