In which medium can electromagnetic waves not travel?

When photons collide with any matter, the radiation attenuates and energy is released as heat. There is variation in the ability of an electromagnetic wave to travel in a given medium, and its ability varies with the nature of the medium and the frequency of the electromagnetic wave. We know that we can see through window glass and clear acrylic plastic.

But we can't see through a brick wall or a block of steel.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.