Cheese mould and liquid-propellant rocket engine: what they have in common

1. Step 1. Cheese mould — is part of — Cheese press. A perforated mould.
2. Step 2. Cheese press — uses — Screw. A screw press.
3. Step 3. Screw — is used in — Propeller. A propeller “screws” itself into the water, like an Archimedes’ screw.
4. Step 4. Propeller — is part of — Airship. Air propellers.
5. Step 5. Airship — uses — Hydrogen. Zeppelins were filled with hydrogen.
6. Step 6. Hydrogen — is used in — Liquid-propellant rocket engine. Hydrogen is an efficient fuel.

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