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 Everyday Examples
Fibonacci Sequence:  The sequence 1, 1, 2, 3, 5, 8, 13, 21, ..., where each term is the sum of the two preceeding terms.
 This sequence of numbers was discovered by an Italian mathematician, Leonardo of Pisa (nicknamed Fibonacci), in 1202 when he was investigating how fast rabbits can breed in ideal conditions. Click here to read more about this discovery as well as extensions, like Dudeney's Cows and bees, Fibonaaci numbers, and family trees! Where Can We See Fibonacci Numbers??Well, Don't Mess With Mother Nature! We can see Fibonacci numbers in nature. For example, consider the sunflower. The head of a sunflower is formed into two opposite sets of spirals, 21 spirals going in one direction and 34 going in the other. These are consecutive numbers in the Fibonacci sequence. There are other spirals in nature that also have Fibonacci numbers. The pine cone has 5 spirals going in one direction and 8 spirals going in the other. The pineapple has 8 and 13. We can even see the Fibonacci sequence in tree branch growth. Start at the bottom and count the number of branches cut by the lines. You will get 1, 2, 3, 5, ... Is all this just a coincidence? I don't know, but remember, "Don't mess with Mother Nature!" More on the Fibonacci Sequence.