How This Site Reached Your Phone

🛰️ The Half-Second Journey

1. 📷 The scan. Your camera reads the QR code's black-and-white grid and decodes it into text: https://apollo13.quest/. A QR code is just a web address wearing a costume.
2. 📖 The phone book. Your phone asks the internet's directory service — DNS — "where is apollo13.quest?" and gets back a number: an IP address. Every device on the internet has one, like a street address.
3. 🤝 The secret handshake. Before sending anything, your phone and the server agree on an encryption code — that's HTTPS, the padlock in your address bar. From now on, anyone eavesdropping on the network sees only scrambled noise.
4. 🏢 The nearest copy. The site is delivered by an edge network — computers in hundreds of cities that each keep a copy close to visitors. Your pages probably came from a server in your region, not from one specific machine far away.
5. 📦 The download. HTML files (the words), a CSS file (the style), JavaScript files (the behavior) arrive, and your browser assembles them into the page you see. View source and it's all there — nothing hidden.
6. 💾 The stash. Quietly, a service worker — a small program that comes with the site — downloads every page into your phone's cache. Why? Keep reading. 👇

✈️ Try It Now: The Airplane Mode Test

Here's a party trick almost no website can do:

1. Turn on airplane mode (kill your Wi-Fi too)
2. Navigate to a mission slide you've never opened
3. It loads. Instantly. With no internet at all.

That's the service worker from step 6. On your very first visit, it stored the entire mission on your phone, so the site keeps working in a tent, in a basement, or in a spacecraft behind the Moon. (Turn your connection back on when you're done!)

📡 Your Phone vs. Apollo's Radio

Apollo 13 talked to Earth over a single radio system called the Unified S-Band — voice, data, and TV all squeezed through one link, at data rates thousands of times slower than the connection your phone is probably using right now. When power ran short, even that link got cut to a whisper (you made that call on slide 16).

On the ground, Mission Control's wall of glowing screens wasn't run by desktop computers — those didn't exist yet. Everything was crunched by IBM mainframes in a back room called the RTCC (Real-Time Computer Complex), each machine filling a good chunk of a room.

The kicker: your phone out-computes all of it combined — the spacecraft and the mainframes — while also being a camera, a flashlight, and a QR code scanner. The engineering lesson isn't "old computers were bad." It's that Apollo did more with less than almost any project in history, because every bit and every watt was budgeted like oxygen.

🔍 Two More Rabbit Holes

🔒 Who's watching you online? On this site: nobody — no cookies, no trackers, and your game progress never leaves your phone. Most of the internet works very differently. Our privacy page explains cookies, tracking pixels, and fingerprinting — and shows you how to inspect any website yourself. It counts toward the Digital Technology badge's internet-safety discussions, too.

📜 Who's allowed to copy this site? You are! It's open source under the MIT License. On GitHub you can read every line — and every change ever made, with a note explaining why. That public change-log is called commit history, and it's the mission log of software: who did what, when, and what went wrong along the way.