The sunflower is an eye-catcher, growing to the sky and brightly singing of summer no matter the time of year. Helianthus annuus is native to the Americas, and its flowering head is actually made up of more tiny flowers that mature into seeds (and, of course, get eaten around the world). But did you know that sunflowers also bring one of nature"s mathematical wonders to life?
© Dileep Chandran/Alamy
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