Leonardo da Pisa a.k.a Fibonacci (son of Bonacci) was one of the greatest mathematician. he has discovered this sequence the, Fibonacci Sequence. It starts off as 0,1,1,2,3,5,8,13,21,34,55,(yes I am doing this in my head...)89...The sequence goes up by adding itself and the last digit [0+0=1(yes in Leonardo's way)+0=1+1=2+1=3+2=5+3=8+5=13=8=21...
Here is a couple of link for the Fascinating Fibonacci's
1. http://www.youtube.com/watch?v=i9TSGhRvZmU
2. http://www.youtube.com/watch?v=BRFa7Jvjp00&feature=related
I just can't stop watching these videos and the "Mankind Is No Island"