I am ignorant, but I read books. You won't believe it, everything is useful... this pebble for instance.
Anyone. It is useful.
For... I don't know. If I knew I'd be the Almighty, who knows all. When you are born and when you die... Who knows? I don't know for what this pebble is useful but it must be useful. For if its useless, everything is useless. So are the stars!