There are times when you park your car, start walking away and you remember that you forgot to lock the doors. You click your remote car keys but you are already just far enough that the signal does not reach your car. Fortunately, there is a lazy way to extend your car remote’s range.
If your hold your remote against your head (such as next to your chin or your temple), you will find that suddenly, the remote works from a longer distance like magic. How can this be?
There are two explanations that factor in.
The first is very simple: height. The higher you hold your remote, the less barrier there is between you and the car, making the signal more likely to reach it. But this cannot be the only answer as the trick works when there is nothing between you and the car.
The second explanation is more technical. When you press the key to your body and click it, the electromagnetic waves that comprise the signal can cross past your clothes and skin into your body, which is mostly composed of water. The water acts as a capacitor as the signal starts to “charge” you, all the while the signal is being rapidly bounced back and forth between the remote and you. In essence, your body acts as a giant aerial that amplifies the signal, almost doubling the range of the remote.
Arthur C. Clarke once wrote: “Any sufficiently advanced technology is indistinguishable from magic”.
But even the simplest scientific principles can seem like magic until we bother looking under the hood.