Ladder and camera: what they have in common

1. Step 1. Ladder — is part of — Fire truck. An extending ladder.
2. Step 2. Fire truck — has part — Centrifugal pump. A fire pump.
3. Step 3. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
4. Step 4. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
5. Step 5. Hydrogen — is material for — Bubble chamber. The working medium is superheated liquid hydrogen.
6. Step 6. Bubble chamber — has part — Camera. Photographing the tracks.

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