Fish hook and turbine: what they have in common

1. Step 1. Fish hook — is made of — Bronze. Bronze, then steel hooks.
2. Step 2. Bronze — is material for — Heron’s aeolipile. The aeolipile is a bronze ball.
3. Step 3. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.

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