The world’s come a long way since the early 1890s when Nikola Tesla proved that it’s possible to transmit energy wirelessly over long distances—but we haven’t come as far as you might have thought. Back then, one might have imagined that today, over 100 years later, we would be living in a wireless world. That hasn’t happened yet, but we’re slowly moving toward that ideal all the time. Technological advances have allowed us to create products that are smaller and more powerful. Plus, we’ve consistently been moving away from stationary, desktop electronics to mobile devices like smart phones, tablets, and MP3 players.