Fibonacci numbers have an interesting feature. When you divide one number in the series by the number before it, you obtain numbers very close to one another. In fact, this number is fixed after the 13th in the series and is known as the "Golden Ratio." The examples of the golden ratio exist in our own bodies and in all living things in nature, are just a few of the proofs that God has created all things with a measure. What do the pyramids in Egypt, Leonardo da Vinci's portrait of the Mona Lisa, sunflowers, the snail, the pine cone and your fingers, all have in common? The answer to this question lies hidden in a series of numbers discovered by the Italian mathematician, Leonardo Fibonacci. The characteristic of these numbers, known as the Fibonacci numbers, is that each one is the sum of the preceding two numbers.