Sunflower seed head (Helianthus annuus). The spiral arrangement of the seeds describe a Fibonacci mathematical series, one in which each number is the sum of the two previous numbers. For example: 0, 1, 1, 2, 3, 5, 8, 13, 21 and so on. This series was discovered by Italian mathematician Leonardo Fibonacci (11701240), and many natural patterns can be described using it.
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