"Some molecules - ammonia, carbon dioxide, water - show up everywhere in the universe, whether life is present or not. But others pop up especially in the presence of life itself. Among the biomarkers in Earth's atmosphere are ozone-destroying chlorofluorocarbons from aerosol sprays, vapor from mineral solvents, escaped coolants from refrigerators and air conditioners, and smog from the burning of fossil fuels. No other way to read that list: sure signs of the absence of intelligence."

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We tried so hard. We were always trying to help each other. But not because we were helpless. He needed to get things for me, just as I needed to get things for him. It gave us purpose. Sometimes I would ask him for something that I did not even want, just to let him get it for me. We spent our days trying to help each other help each other. I would get his slippers. He would make my tea. I would turn up the heat so he could turn up the air conditioner so I could turn up the heat.

— Jonathan Safran Foer