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The Hidden Math Behind Your Bank Card: The Luhn Algorithm Explained

Every time you type a card number online, something checks it before your bank even sees it. That something is a 65-year-old math formula. Here is how it works.

May 21, 2026 11 min read

nion-cli

I Built My Own AI CLI Tool and Put It on npm - Here's the Whole Story

I wanted to use OpenClaw but my laptop couldn't handle it. So I thought - why not build my own? nion-cli: agent mode, 10+ AI providers, Telegram bot.

May 14, 2026 8 min read

vscode

Let's learn python

Learn python with me

May 1, 2026 14 min read