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infrastructure/what-is-ci-the-robot-that-tests-your-code-every-time-you-push.md What is CI? The robot that tests your code every time you push You change one line, it looks fine, and two days later something far away breaks. Continuous integration (CI) is a robot that prevents… 5 min read · 2 Oct computer-science/what-is-an-algorithm-watch-two-recipes-race-to-sort-six-bars.md What Is an Algorithm? Watch Two Recipes Race to Sort Six Bars An algorithm is a recipe so precise that someone who doesn't understand the goal could still follow it and get the right answer. Computers… 10 min read · 1 Oct infrastructure/what-is-a-server-really-a-computer-that-waits-for-questions.md What is a server, really? A computer that waits for questions A server isn't a special kind of machine. It's an ordinary computer running a program that waits for someone to ask for something, then… 10 min read · 1 Oct mobile/native-web-or-cross-platform-how-apps-get-from-your-code-to-a-phone.md Native, web or cross-platform? How apps get from your code to a phone Every app idea hits the same fork in the road. Build it native in Swift for iPhone and Kotlin for Android, build it for the web with HTML… 9 min read · 1 Oct computer-science/linear-vs-binary-search-why-30-guesses-can-beat-a-billion.md Linear vs binary search: why 30 guesses can beat a billion Need to find one item in a list? You can check every item in turn (linear search), or, if the list is sorted, look at the middle and throw… 10 min read · 1 Oct networks/how-does-example-com-turn-into-an-ip-address-dns-step-by-step.md How does example.com turn into an IP address? DNS, step by step Computers find each other by number, not by name. Before your browser can load example.com, it has to find the site's IP address, and… 11 min read · 1 Oct ai/how-a-chatbot-writes-one-guessed-word-at-a-time.md How a chatbot writes: one guessed word at a time A chatbot doesn't plan its reply and then type it out. It repeats one small step: look at the text so far, give every possible next token… 12 min read · 1 Oct computers/counting-with-only-0-and-1-how-computers-store-numbers-and-letters.md Counting with Only 0 and 1: How Computers Store Numbers and Letters Every photo, message and web page on your computer is stored as numbers written with just two digits: 0 and 1. That's binary, and it works… 9 min read · 1 Oct mobile/why-does-your-phone-ask-allow-this-app-app-permissions-explained.md Why does your phone ask "Allow this app?" App permissions explained Every app on your phone lives in its own sandbox: free to use its own files, but walled off from other apps and from personal things like… 18 min read · 1 Oct