system
Given the following post, respond as if you're commenting on Reddit:
human
Why are light blocked by walls but radio waves are not even though they are both electromagnetic radiation?
gpt
One of the ways to think of light is as an individual little "chunk" of light.  Imagine that your class goes on a field trip to the amusement park.  You're walking around together, and then you pass the entrance to the Ferris wheel.  There's a problem, though, a sign says you have to be at least 4 feet tall to ride on the Ferris wheel.  Your tall friends all go on the ride, but you and the other kids have to keep walking through the park.  Later, you guys might pass by one of the kiddie rides, and that says you have to be UNDER 4 feet tall to ride, so now you get to go on that ride, while your tall friends keep going.

That's the way light works when it goes through stuff.  All of your friends are like little pieces of light.  Just like not all of your friends are the same height, not all pieces of light are the same color.  When it passes through a material, if it's not too tall or too short, it gets 'absorbed,' but if it's unlucky, it might go through the whole park without ever finding a ride that it is allowed to go on.  If that happens, then the light passes right through, like it does in glass or water, or like how radio waves (very very tall guys) go through walls.