Metal sphere and electric fan: what they have in common

1. Step 1. Metal sphere — is part of — Van de Graaff generator. It stores charge.
2. Step 2. Van de Graaff generator — is made of — Vulcanized rubber. The belt is rubber.
3. Step 3. Vulcanized rubber — is material for — Hovercraft. The skirt is rubberized fabric.
4. Step 4. Hovercraft — has part — Propeller. Air propellers.
5. Step 5. Propeller — is part of — Electric fan. The blades.

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