Eine tolle Idee aus Afrika: Licht, das durch die Schwerkraft erzeugt wird:
„Over 1.2 billion people globally have no access to electricity and millions more have an unreliable supply. Instead they use dangerous, polluting and expensive kerosene lamps for light.
Combining kinetic and potential energy, GravityLight works by connecting an elevated weight — filled with rocks or sand — to a pulley system that slowly powers a generator as the weight falls to the ground….“
Weiterlesen..: https://gravitylight.org/