Piezoelectric effect and kiln: what they have in common

1. Step 1. Piezoelectric effect — is used in — Lighter. Piezo lighters.
2. Step 2. Lighter — evolved from — Fire making. A fire striker.
3. Step 3. Fire making — is used in — Pottery. The first pottery was fired right in a campfire.
4. Step 4. Pottery — uses — Kiln. Firing in a kiln makes clay strong.

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