Fibonacci numbers
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These came up in discussion with E and A today, after we saw a pine cone. I've long liked the Fibonacci sequence because of how they pop up in nature.
Fibonacci sequences appear in biological settings, such as branching in trees, arrangement of leaves on a stem, the fruitlets of a pineapple, the flowering of artichoke, an uncurling fern and the arrangement of a pine cone, and the family tree of honeybees.
1 Elsewhere
1.1 In my garden
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