By asking a novel question that you don't know the answer to, you discover whether you can formulate a way of finding the answer, and you stretch your own mind, and very often you learn something new.
“A whole army, though they can neither write nor read, are not afraid of a platform, which they know is but earth or stone; nor of a cannon, which, without a hand to give fire to it, is but cold iron; therefore a whole army is afraid of one man.”