"I open my scuttle at night and see the far-sprinkled systems, All all I see multiplied as high as I can cipher edge but the rim of the farther systems. Wider and wider they spread, expanding, always expanding, Outward and outward and forever outward."

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Twin primes: pairs of prime numbers that are close to each other, almost neighbors, but between them there is always an even number that prevents them from truly touching. If you go on counting, you discover that these pairs gradually become rarer, lost in that silent, measured space made only of ciphers. You develop a distressing presentiment that the pairs encountered up until that point were accidental, that solitude is the true destiny. Then, just when you’re about to surrender, you come across another pair of twins, clutching each other tightly.

— Paolo Giordano