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

1. Step 1. Globe sphere — is part of — Globe. A sphere with a map.
2. Step 2. Globe — evolved from — Map. A model of the Earth.
3. Step 3. Map — evolved into — GPS (satellite navigation). Digital navigation on a map.
4. Step 4. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
5. Step 5. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.

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