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In the 1840s, shortly after publishing his poem “The Vision of Sin,” Alfred Lord Tennyson received a letter from a Cambridge mathematics professor, who had a problem with a couplet in the middle that read:
“Every minute dies a man,
Every minute one is born.”
“If this were true,” the mathematician wrote, “the population of the world would be at a standstill. In truth, the rate of birth is slightly in excess of that of death.”