Online maps and sewage treatment plant: what they have in common

1. Step 1. Online maps — uses — GPS (satellite navigation). The position.
2. Step 2. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
3. Step 3. Reusable rocket — is made of — Kerosene. The fuel is kerosene or methane.
4. Step 4. Kerosene — is used in — Turbojet engine. Jet fuel is kerosene.
5. Step 5. Turbojet engine — has part — Compressor. The compressor compresses the air.
6. Step 6. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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