Van de Graaff generator and kiln: what they have in common

1. Step 1. Van de Graaff generator — evolved from — Electrostatic machine. A belt generator.
2. Step 2. Electrostatic machine — uses — Friction. Friction.
3. Step 3. Friction — is used in — Fire making. Fire was made by rubbing wood against wood.
4. Step 4. Fire making — is used in — Pottery. The first pottery was fired right in a campfire.
5. Step 5. Pottery — uses — Kiln. Firing in a kiln makes clay strong.

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