system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do WIFI waves travel through walls?
gpt
It's sort of the same as asking: how does visible light travel through windows? Every single material has certain wavelengths of light they are allowed to absorb. If this were not true then windows would be completely opaque! So in the same idea, certain materials are unable to absorb radio waves, so these waves can travel right through without much problem since the chemical bonds and atoms don't want to absorb it since they can only allow discrete (specific) values of energy to be absorbed.