Hydrofoil wings and fitness tracker: what they have in common

1. Step 1. Hydrofoil wings — is part of — Hydrofoil. They lift the hull out of the water.
2. Step 2. Hydrofoil — has part — Propeller. A propeller.
3. Step 3. Propeller — is part of — Hovercraft. Air propellers.
4. Step 4. Hovercraft — is made of — Vulcanized rubber. The skirt is rubberized fabric.
5. Step 5. Vulcanized rubber — is material for — Fitness tracker. The strap is silicone.

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