Decorators explained clearly
I implemented a Monad in Python so you don't have to.
Monoids sound like something you get vaccinated for, but they're actually quite useful
According to Wikipedia The Collatz conjecture is a conjecture in mathematics named after Lothar Collatz. It concerns a sequence defined as follows: start with any positive integer n. Then each term is obtained from the previous term as follows: if the previous term is even, the next term is one