[voiceover] Light is a particle and a wave. This is hard to understand how a thing can be two things at once; but a woman is also both a particle and a wave. She's a wave when you see her reach down to pull a shell from the sea, and you feel her beauty pass through you like electrical current. She's a particle when her hair brushes your face, and her hands push into yours. And a child is also a particle and a wave. He is a wave the sound of his pain shoots through and twists you away from yourself. And he is a particle when a doctor hands you a baby; a small mirror. Women, children and light can be two things at once; a particle, a wave. They ricochet off the hard surfaces and illuminate the corners. Without them it would be far darker.
[voiceover] Uranium, Neptunium, Plutonium. They came from space; found their way here by comet and meteorite. No child ever wished this from a star. Hiroshima, Nagasaki, Chernobyl. Problems with half-lives forty-thousand years long. Half a life. Time takes half of us away and comes back later for the rest. We are children and then we are parents. We are long division. Slowly we decay into memory.
[voiceover] In the end, everything decays to lead, number eighty-two on the periodic table. All of the brilliant things born in the center of stars will have turned cold and gray. Everything is moving in that direction. Toward lead. Impossible to stop.