“Prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.” The narrator-protagonist of Mark Haddon’s novel, The Curious Incident of the Dog in the Night-time , makes that captivating observation. 15-year-old Christopher loves numbers and has a way with them. For example, ask him ‘What’s 251 times 864?’ and he’ll tell you in a moment the answer: 216,864. It’s easy, he will tell you, you just multiply 864 x 1000 which is 864,000. Then you divide it by 4 which is 216,000 and that’s 250 x 864. Then you just add another 864 on to it to get 251 x 864. And that’s 216,864. He’s good at science too. What he’s not good at is understanding people. People are more complicated than maths and science. They tell lies. They have complex emotions and motives. And beliefs. Christopher tells us that he cannot tell lies, ‘not because I am a good person. It is because I can’t tell lies.’ His mind is too logical t
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