Geostationary orbit and sewage treatment plant: what they have in common

1. Step 1. Geostationary orbit — is used in — Communications satellite. Geostationary orbit.
2. Step 2. Communications satellite — has part — Solar panel. Power comes from solar panels.
3. Step 3. Solar panel — is used in — Energy-efficient house. Solar energy.
4. Step 4. Energy-efficient house — uses — Heat pump. Heating.
5. Step 5. Heat pump — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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