November 23 is Fibonacci Day

From the link: Also known as Leonardo of Pisa and Leonardo Fibonacci, Leonardo Bonacci invented a pattern of counting that continues to influence math and technology today. The pattern is made up of numbers that sum the previous two numbers before them — 1, 1, 2, 3, 5, 8, 13 — and so on. The sequence is used in computing, stock trading, and architecture and design.

Once we discovered the sequence, it started showing up everywhere. Nature is full of Fibonacci patterns, from DNA to hurricanes, leading some to dub the Fibonacci sequence “nature’s secret code.”
[nationaltoday.com]