Leonardo Bonacci was born in Pisa, Italy in 1170. In 1506 he was referred to as Lionardo Fibonacci in a publication. Then in 1838 that morphed into just Fibonacci. Whatever the moniker, he was critically important to mathematics. He's the guy who introduced the use of the Arabic number system to the western world. Good riddance to those strange Roman numerals! He's also the originator of the mathematical sequence that controls the number of spirals in various plant inflorescences, like these mugo pine cones. His original description was of generations of rabbits. Remember the other day when I mentioned end slope. Bad memory! It should have been end behavior, describing the ultimate nature of a graph line (Katie set me straight, several times). Can you imagine the end behavior of that line of rabbits?