Answer:
How do you blink twice without blinking twice?
Is an older one-hundred dollar bill worth more than a newer one?
How do you discover something that does not exist?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
What man can shave 10 times a day and still have a beard?
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?