The same way light passes through glass. Lots of things are transparent on different wave spectrums. In the wave of x-rays, the skin is transparent but the bones are not.
Coke is actualy transparent in the UV spectrum but oil distorts uv rays.
Radiation goes through most things but is blocked by lead and other dence materials
Wireless transmission is just a part of the eletro magnetic spectrum and all things act differently there
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