Answer:
You draw a line. Without touching it, how do you make the line longer?
How do you discover something that does not exist?
Is an older one-hundred dollar bill worth more than a newer one?
First I threw away the outside and cooked the inside then I ate the outside and threw away the inside. What did I eat?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?