In this amazing video, you can see how this inventor perfected his invention to make electricity to light up a led-bulb.
Using gravity to make free electricity is well known especially harnessing the water in dams and using gravity to flow them through turbines that create electricity.
In this video, it shows usage of this invention for poor people in remote villages, but it can be used for many other applications such as charging your smartphone while hiking for a few days in remote locations.
