Fibonacci numbers are important in numerous branches of mathematics, but I was drawn to this series as a topic for this year’s puzzle mostly because it occurs in many places in the natural world.

In the first 100 Fibonacci numbers, the inverse ratio of consecutive Fib numbers falls between 0.617 and 0.619 a total of 91 times.

For our third anniversary, we decided to change tack. The OneSpin 2018-19 Holiday Puzzle challenged engineers to design a digital circuit that computes Fibonacci numbers. To check out the latest ...