How astonishing and how touchingly human, then, that Feynman penned the letter Gleick found in the box forty-two years later—a letter to Arline dated October 1946, four hundred eighty-eight days after her death: D’Arline, I adore you, sweetheart. I know how much you like to hear that—but I don’t only write it because you like it—I write it because it makes me warm all over inside to write it to you. It is such a terribly long time since I last wrote to you—almost two years but I know you’ll excuse me because you understand how I am, stubborn and realistic; and I thought there was no sense to
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