Scissors and heat pump: what they have in common

1. Step 1. Scissors — uses — Wedge. The blades cut like wedges.
2. Step 2. Wedge — is part of — Zip. The slider works like a wedge, bringing the teeth together and pushing them apart.
3. Step 3. Zip — is part of — Wetsuit. A zip on the back.
4. Step 4. Wetsuit — uses — Thermal insulation. Insulation.
5. Step 5. Thermal insulation — is used in — Energy-efficient house. Insulation.
6. Step 6. Energy-efficient house — uses — Heat pump. Heating.

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