$ cd ~
// ~/playground

Things to poke at

Interactive explainers. Not quite posts, not quite projects: move a slider, watch the physics change. Each one starts with a question I couldn't stop thinking about.

$ ls -l ~/playground # 11 live, 0 moving in
drwxr-xr-x oct 21 neuron-census/ Neuron Census · 36,864 neurons, one question We trained our own GPT from scratch, then asked every neuron in it whether it has one job. Click around inside the model in 3D, read what two blind raters found, delete its weak and strong firings, and turn one neuron up to see what it does. drwxr-xr-x oct 20 neuron-explorer/ Neuron Explorer · What every neuron likes Click a photo and watch it climb four image models, layer by layer, in 3D: every neuron a tile that glows when the photo fires it. Then open any neuron to see the photos it likes most, and the few names that passed a test. drwxr-xr-x oct 20 git/ Git Pond · Nothing gets lost Git with the lights on: 26 lessons from git init to rebase -i, bisect, pull requests and force pushes, then 12 challenges scored against par, plus a simulator for your team's branching strategy. Branches are sticky notes, HEAD is a duck, and nothing you committed is ever really gone. Real commands, real hashes. drwxr-xr-x oct 19 sql/ SQL Rows · Show me the rows SQL with the actual data instead of Venn diagrams. Watch a join test every pair, walk into the traps (the WHERE that eats a LEFT JOIN, fan-out, the NOT IN that returns nobody), then GROUP BY, CASE and window functions. drwxr-xr-x oct 18 feeding-time/ Feeding Time · Feed the fish, grab the coins A fish-tank money game in the spirit of Insaniquarium: feed the guppies, grab the coins, buy the egg, and shoot whatever comes through the portal. Built for a phone. drwxr-xr-x oct 18 holdem/ Hold'em Retriever · The math behind every call A Limit Hold'em trainer against a table of tunable bots, with a coach that shows the pot odds, equity and EV behind every decision. drwxr-xr-x oct 18 shooting-hours/ Shooting Hours · When the light goes legal Wisconsin shooting hours for wherever you are standing, straight from the DNR's own tables: your area, your zone minutes, daylight saving handled. Live countdown, works offline in the blind. drwxr-xr-x oct 17 power/ Power Injection · Where the volts go LED power injection for WLED builds, solved as one circuit. Mix 5, 12 and 24 V strings, drag the feeds, watch the voltage and colour at every pixel. drwxr-xr-x oct 15 transformer/ Tiny Transformer · Inside a tiny language model A real 432k-parameter model trained on Jules Verne, live in your browser. Every weight on screen: trace a guess, switch off heads, watch it learn. drwxr-xr-x oct 11 recoil/ Recoil · Where the kick comes from Recoil & ballistics calculator: shotshell, rifle, pistol, rimfire. Compare two loads, then see why heavy-and-slow kicks harder. drwxr-xr-x oct 06 one-gate/ One Gate · Build a computer from one gate From a single transistor to a Turing-complete machine, using nothing but NAND. Push the switches, watch the signal move.