Leonardo Pisano, aka Fibonacci: Fibonacci was a 13th-century Italian mathematician who invented the Fibonacci series, which goes like this: 1, 1, 2, 3, 5, 8, 13, 21, etc. Each of the numbers is the sum of the two preceding numbers. I look at the sequence again. I know I recognize it from somewhere. It takes me a couple of seconds, but then it clicks: Boggle! It's the scoring system for my favorite find-a-word game, Boggle.