Hypocaust and laser: what they have in common

1. Step 1. Hypocaust — evolved into — Central heating. The Roman hypocaust was an early central heating system.
2. Step 2. Central heating — has part — Boiler. A boiler.
3. Step 3. Boiler — is part of — Steam turbine. Steam from the boiler.
4. Step 4. Steam turbine — is part of — Solar concentrator. Heated steam turns a turbine.
5. Step 5. Solar concentrator — has part — Mirror. Mirrors concentrate the light.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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