Vacuum flask and saw: what they have in common

1. Step 1. Vacuum flask — uses — Thermal insulation. Insulation.
2. Step 2. Thermal insulation — is used in — Wetsuit. Insulation.
3. Step 3. Wetsuit — has part — Zip. A zip on the back.
4. Step 4. Zip — has part — Wedge. The slider works like a wedge, bringing the teeth together and pushing them apart.
5. Step 5. Wedge — is used in — Saw. Each tooth of a saw is a small wedge.

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