Mostly here and here.
As for what I'm wanting to shield from, I just want to know when and WHY a faraday cage might not be able to completely block EM signals(i.e when the frequency is either too high or too low)
I've been reading about faraday cages. The way I see, it works because the condutor will separate the charges so that the eletric charge inside is 0.
Then I saw a lecture in which the professor was carrying a radio and the signal stopped as soon as he entered the cage however we were still able...