Space Shuttle and camera: what they have in common

1. Step 1. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.
2. Step 2. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
3. Step 3. Hydrogen — is material for — Bubble chamber. The working medium is superheated liquid hydrogen.
4. Step 4. Bubble chamber — has part — Camera. Photographing the tracks.

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