There's nothing subtle about sunflowers. There they stand, taller than the garden fence, with vibrant yellow heads screaming summer and 'look at me'. But as summer turns to autumn, their heavy heads ...

Celebrate the simple mathematical sequence that is hidden in everything from sunflower spirals to Da Vinci's paintings ...

If you don’t know what Fibonacci day is then go now and have a look at the calendar, write today’s date in the Month/Day format (11/23), … ...