Pin tumbler lock and r-7 rocket: what they have in common

1. Step 1. Pin tumbler lock — uses — Universal gravitation. The pins drop into holes in the bolt under their own weight.
2. Step 2. Universal gravitation — is used in — Water tower. Pressure from height.
3. Step 3. Water tower — has part — Centrifugal pump. Filled by pumps.
4. Step 4. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
5. Step 5. Liquid-propellant rocket engine — is part of — R-7 rocket. RD-107 and RD-108 engines.

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