I have a vision that never ceases to entertain me. I imagine the vast universe, with its hundreds of billions of galaxies. Each galaxy contains hundreds of billions of stars. Around each star, I picture planets of limitless variety. I imagine these trillions of monstrously sized objects slowly orbiting each other in the vast emptiness of space for billions of years. What amazes me is that the only thing in the universe that knows about this—the only thing that knows that the universe exists at all—is our brain. If it wasn’t for brains, then nothing would know that anything exists.
