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How does typing turn into letters on a screen?

Key's Lightning Run
How does typing turn into letters on a screen?
You press a key, and ~~boom~~ — a letter appears on your screen. Seems instant, right? But between your finger and that

You press a key, and boom — a letter appears on your screen. Seems instant, right? But between your finger and that glowing letter, there's a wild relay race happening at lightning speed.

Under each key sits a little switch. When you push down, the switch closes a circuit — like flipping a light switch — and electricity flows. That electrical signal is the key's way of shouting "I've been pressed!"

How was this book?