Based on my understanding, wireless signals are lights. Why can I use my gadgets inside a room?
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The materials which are opaque to visible light are not necessarily opaque to other wavelengths, such as radio waves.
This was a bit of mind-blown moment for me, back when I realised this. It shows how things like opaqueness and colour are not basic properties of materials, but depend on the wavelengths interacting with them.
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