Superfluidity and multistage rocket: what they have in common

1. Step 1. Superfluidity — uses — Helium. Liquid helium.
2. Step 2. Helium — is used in — Airship. After the Hindenburg — helium.
3. Step 3. Airship — uses — Hydrogen. Zeppelins were filled with hydrogen.
4. Step 4. Hydrogen — is used in — Saturn V. Hydrogen stages.
5. Step 5. Saturn V — is a kind of — Multistage rocket. A rocket.

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