Answer:
What is it that after you take away the whole some still remains?
The Titanic is still here. What am I?
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.
I will disappear every time you say my name. What am I?
The more of me you take, the more I appear behind you. What am I?
What made Cyclops quit teaching?