Endoscope and heat pump: what they have in common

1. Step 1. Endoscope — has part — Smartphone camera. Video endoscopes.
2. Step 2. Smartphone camera — is part of — Lunokhod. TV cameras.
3. Step 3. Lunokhod — has part — Solar panel. A solar panel.
4. Step 4. Solar panel — is used in — Energy-efficient house. Solar energy.
5. Step 5. Energy-efficient house — uses — Heat pump. Heating.

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