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And his most recent book is The Math Instinct: Why You're a Mathematical Genius Along With Lobsters, Birds, Cats and Dogs.
NPR: The Math Behind Pellicano's Code
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The case has gripped the British public for more than a year and a half, since Williams, an MI6 agent known for his mathematical genius and codebreaking talent, was found dead at age 31 in August 2010.
CNN: STORY HIGHLIGHTS