Why You Can't Add Velocities
▶ DRILLVika's ship flies at half light-speed and fires a probe forward at half light-speed. The everyday rule from How Speeds Normally Add says just add them — a whole light-speed. But George measures only 0.8c: speeds don't simply add. The real total is always squished to stay under light-speed, and firing actual light gives exactly c — the same answer everyone gets. That's why nothing can outrun light. Use the Explain it for a kid / a grown-up switch to set the depth.
The big idea — you can't just add speeds when they're huge. Adding would push things past light-speed, and nothing ever goes that fast — so the real total gets squished back under light. At everyday speeds the squish is so tiny you'd never notice (that's why drill 01's "just add" works perfectly for cars and trains). And fire light itself, and everyone measures plain light-speed — exactly the light drill. This is the reason nothing can outrun light, which is a whole drill of its own.