I find it amazing that the only thing in the universe that knows the universe exists is the three-pound mass of cells floating in our heads. It reminds me of the old puzzle: If a tree falls in the forest and no one is there to hear it, did it make a sound? Similarly, we can ask: If the universe came into and out of existence and there were no brains to know it, did the universe really exist? Who would know? A few billion cells suspended in your skull know not only that the universe exists but that it is vast and old.
