a random walk.https://arandomwalk.net/https://arandomwalk.net/posts/hello-world/https://arandomwalk.net/posts/hello-world/Every blog starts with a hello world, and this one is no exception — except that here, you arrived by accident. A walk left the origin, wandered through a few branches, and …Thu, 02 Jul 2026 00:00:00 GMThttps://arandomwalk.net/posts/on-brownian-motion/https://arandomwalk.net/posts/on-brownian-motion/In 1827 Robert Brown watched pollen grains jitter in water and assumed, reasonably, that they were alive. They weren't. They were being shoved, thousands of times a second, by …Sun, 14 Jun 2026 00:00:00 GMThttps://arandomwalk.net/posts/the-coastline-paradox/https://arandomwalk.net/posts/the-coastline-paradox/How long is the coastline of Britain? It depends on your ruler. Measure with a 200 km stick and you get about 2,400 km. Measure with a 50 km stick and you get 3,400 km. Shrink the …Thu, 21 May 2026 00:00:00 GMThttps://arandomwalk.net/posts/walking-without-a-map/https://arandomwalk.net/posts/walking-without-a-map/There is a specific pleasure in leaving the house with no destination. Not lost — losing yourself takes effort in a city you know — but unassigned. Take the street you've never …Thu, 09 Apr 2026 00:00:00 GMThttps://arandomwalk.net/posts/notes-on-entropy/https://arandomwalk.net/posts/notes-on-entropy/Entropy gets described as "disorder," which is a shame, because the better word is ignorance. The entropy of a system is how much you don't know about it given what you can …Tue, 17 Mar 2026 00:00:00 GMThttps://arandomwalk.net/posts/music-for-walking/https://arandomwalk.net/posts/music-for-walking/Some music is for sitting still and some is for motion, and the difference isn't tempo. Plenty of slow music walks beautifully; plenty of fast music demands a chair. My theory: …Sun, 08 Feb 2026 00:00:00 GMT