Fibonacci Day is November 23rd, and celebrates the work of medieval mathematician Leonardo of Pisa. We have no solid dates on Leonardo, but 11-23 was chosen as those are the first numbers in the sequence. In honour of the day, Science Magazine published an article on an American mathematician who utilized the Fibonacci series to solve German mathematician David Hilbert’s 10th problem of his original list of twenty-three. Her name was Julia Robinson. Who is Fibonacci and why do we care? Leonardo Fibonacci, slang for Filius Bonacci, son of Bonacci, was a medieval Italian mathematician who wrote Liber abaci “Book…