Railway coupling and heron’s aeolipile: what they have in common

1. Step 1. Railway coupling — is made of — Wrought iron. A coupling is wrought iron.
2. Step 2. Wrought iron — is material for — Ocean liner. The hull is iron, later steel.
3. Step 3. Ocean liner — has part — Turbine. Large liners run on steam turbines.
4. Step 4. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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