Barcode and liquid-propellant rocket engine: what they have in common

1. Step 1. Barcode — uses — Laser diode. Barcode scanners use lasers.
2. Step 2. Laser diode — is part of — Lidar. Laser pulses.
3. Step 3. Lidar — is part of — Self-driving car. Lidar builds a 3D map of the surroundings.
4. Step 4. Self-driving car — has part — GPS (satellite navigation). Satellite navigation.
5. Step 5. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
6. Step 6. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.

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