Scattered notes

The origin of the Collatz conjecture and the man who jotted it down: Lothar Collatz, a giant of numerical analysis rather than a puzzle hunter. With an interactive timeline and orbits.

How the Fibonacci numbers appear, uninvited, inside the Collatz conjecture. A general-audience note with interactive simulators you can walk through with high-school mathematics.

An essay on the parallels between the Collatz conjecture and Tolkien's work. Maps, Rings and wrong hobbits.