Electric kettle and kiln: what they have in common

1. Step 1. Electric kettle — evolved from — Kettle. A kettle with a heater.
2. Step 2. Kettle — has part — Pot lid. A cap.
3. Step 3. Pot lid — is part of — Saucepan. A cap.
4. Step 4. Saucepan — evolved from — Pottery. The first pots were ceramic.
5. Step 5. Pottery — uses — Kiln. Firing in a kiln makes clay strong.

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