06/11/2026
The Fibonacci sequence: each number is the sum of the two before it. 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89… Count the spirals at the heart of a sunflower, once clockwise and once counterclockwise. You will usually find two consecutive numbers of the sequence: 34 and 55, or 55 and 89. You will see the same in pine cones (8 and 13) and pineapples. Leonardo of Pisa, known as Fibonacci, brought it to Europe in “Liber Abaci” (1202). In India it was known centuries earlier.
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