Liquid-propellant rocket engine and data centre: what they have in common

1. Step 1. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
2. Step 2. Hydrogen — is used in — Airship. Zeppelins were filled with hydrogen.
3. Step 3. Airship — uses — Helium. After the Hindenburg — helium.
4. Step 4. Helium — is material for — Large Hadron Collider. It is cooled with superfluid helium.
5. Step 5. Large Hadron Collider — uses — Data centre. A grid for processing data.

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