When the battery runs out, it’s nerve-racking, but unfortunately, it happens. The more functions our devices provide, the more power they need, and they’re hungrier than hungry hippos at this point! That’s why charging technology is all the rage now, and the new big thing is wireless charging.

Even though we’re just now seeing this technology take off, the basics of how it works were discovered not long after we started to understand what electricity is. Near the end of the 19th century, engineering mastermind Nikola Tesla showed that two powerful magnetic fields can slightly transfer energy between their sources when they interfere with each other. This trick found its use more than a hundred years later!

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