Fibonacci numbers have all sorts of amazing properties and links to many different kinds of mathematics. They start off with 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89 ...

Pine cones. Stock-market quotations. Sunflowers. Classical architecture. Reproduction of bees. Roman poetry. What do they have in common? In one way or another, these and many more creations of nature ...