And when the universe has finished expoding, all the stars will slow down, like a ball that has been thrown into the air, and they will come to a halt and they will all begin to fall toward the center of the universe again. And then there will be nothing to stop us from seeing all the stars in the world because they will all be moving toward us, gradually faster and faster, and we will know that the world is going to end soon because when we look up into the sky at night there will be no darkness, just the blazing light of billions and billions of stars, all falling.

I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your life thinking about them.