Answer:
In many years, not much has happened. In many minutes, a lot has happened. In one second, everything has happened.
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
Pregnant every time you see her, yet she never will give birth.
What is red and nailed to a wall?
What stays the same size no matter how much they weight?
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.