how can radiation penetrate eveything but still leaves no visible holes
In: Physics
The same way that light passes through glass.
Some radiation is good at getting through different things, and/or some things are transparent to different kinds of radiation.
For example, the normal frequency for Wifi (2.4ghz), is pretty good at getting through most things. It gets blocked by metal and water, mostly. If you imagine a strong light bulb sitting where your router is, and that everything in your home that isn’t water and metal were glass, you would have a pretty good idea of where your wifi works well. Wherever a shadow is cast, it will not have the strongest signal.
To very powerful radiation, everything is glass.
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