"The production of motion in the steam engine always occurs in circumstances which it is necessary to recognize, namely when the equilibrium of caloric is restored, or (to express this differently) when caloric passes from the body at one temperature to another body at a lower temperature."

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My son called to me that God was inside his red fire engine. He wanted to show me. I did move as fast as I could, spilling like water through the kitchen door into a summer day, but God had left by the time I got there. My son smiled, told me I'd missed him by seconds.

— Deborah Keenan