District heating heat exchangers and LIGO: what they have in common

1. Step 1. District heating heat exchangers — is part of — Combined heat and power plant. They heat district-heating water with bled steam.
2. Step 2. Combined heat and power plant — has part — Steam turbine. Steam turns the turbine.
3. Step 3. Steam turbine — is part of — Solar concentrator. Heated steam turns a turbine.
4. Step 4. Solar concentrator — has part — Mirror. Mirrors concentrate the light.
5. Step 5. Mirror — is part of — Laser. A resonator made of mirrors.
6. Step 6. Laser — is used in — LIGO. A laser.

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