The Fibonacci sequence appears in the arrangement of leaves on a stem. - Apparently.
Research by botanist Daniel Knecht in 1987 found that the leaves on stems of the plant Achillea millefolium, also known as yarrow, follow the Fibonacci sequence. Specifically, the leaves are arranged such that the ratio of the distance between each node and the distance between consecutive leaves is approximately 1.618. This is a common pattern in nature, observed in many plant species, and is thought to be an efficient way to maximize exposure to sunlight.