Heat-sealed seams and kiln: what they have in common

1. Step 1. Heat-sealed seams — is part of — Plastic bag. Heat-sealing of the bottom and sides.
2. Step 2. Plastic bag — has part — Handles. Cut-out handles.
3. Step 3. Handles — is part of — Saucepan. Handles.
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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