Riddler Case of the Missing Birth Month Riddler Express solution for the problem of an unrepresented birth month for a group of officemates.

Riddler Fibonacci Fun A Riddler Classic problem gives us an excuse to implement and benchmark Fibonacci calculations in Julia.

Riddler Hyperpolarization How many polarized lenses make a quarter turn of polarized light with the most intensity?

Riddler Happy birthday to you! And you! And … you! Calculate the probability of having a three-fold birthday collision. More than 50% more difficult than your ordinary birthday collision!

Riddler The longest interstate walk Meandering through US states and territories with Julia, never looking back. Well, just their USPS codes.

Riddler Am I going to win the U.S. Open? Estimating the probability of winning the US Open men's and women's tournaments with Julia code and a toy model. Also an increasingly large (as I write this) exposition of Bayesian methods.