There is no definitive census of all the intelligent species in the universe. Not only are there perennial arguments about what qualifies as intelligence, but each moment and everywhere, civilizations rise and fall, much as the stars are born and die.

Time devours all.

Yet every species has its unique way of passing on its wisdom through the ages, its way of making thoughts visible, tangible, frozen for a moment like a bulwark against the irresistible tide of time.

Everyone makes books.

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