[Reeses]

It turns out that potatoes – because of their water content and chemistry – absorb and reflect radio wave signals much the same way as the human body does, making them suitable substitutes for airline passengers.

Sitting inside an aluminum tube with wi-fi is like sitting inside a microwave oven. There is iron in every cell of the human body, and iron is how blood carries oxygen, which is what gives blood its metallic taste. Iron is also the key element in a radio antenna. It doesn't seem likely second-hand wi-fi has absolutely no ill effects.

[jjotto]

What about earth’s magnetic field? Magnets pointing north works in a lot of different kinds of environments.