An off topic item this time; a little mathematics from my garden.
One takes a head of a sunflower, let it dry for a while and concentrates on the seeds and their arrangement.
The arrangement of spirals in the head of a sunflower appears to show Fibonnaci numbers:
The Fibonnaci Sequence is constructed with the formula F(n) = F(n-1) + F(n-2) and the beginning of the sequence is as follows:
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144..
Amazing that Fibonnaci numbers seem to appear in nature a lot.