There’s this guy you might have heard of, Nikola Tesla. An inventor and scientist of legendary status, he established the fundamentals of modern-day supply of electricity, including the way power gets to your home right now. He also explored the potential of wireless energy transfer, dreaming of a world where power is available to all – wirelessly and at no cost. Alas, his ambitious idea did not materialize, but the principles behind Tesla’s wireless power distribution system are still in use a century later – in every smartphone that supports wireless charging, for instance.