Protective backing paint and heron’s aeolipile: what they have in common

1. Step 1. Protective backing paint — is part of — Wall mirror. It protects the amalgam.
2. Step 2. Wall mirror — is a kind of — Mirror. A mirror.
3. Step 3. Mirror — is part of — Solar concentrator. Mirrors concentrate the light.
4. Step 4. Solar concentrator — has part — Steam turbine. Heated steam turns a turbine.
5. Step 5. Steam turbine — is a kind of — Turbine. A kind of turbine.
6. Step 6. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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