Look into the centre of a sunflower and you'll find one of nature's most beautiful pieces of mathematics hiding in plain sight.
The seeds aren't in neat rows — they curve outward in two sets of spirals, one winding clockwise and one anticlockwise. Count them, and something remarkable turns up: the number of spirals in each direction is almost always a pair of consecutive Fibonacci numbers — like 34 and 55, or 55 and 89.
As the seed head grows, each new seed is added at an angle of about 137.5° — the "golden angle" — around from the last. That precise turn packs the seeds together with no gaps and no crowding, fitting the most seeds into the space. The Fibonacci spirals are simply what that perfect packing looks like.