Wheellock and kiln: what they have in common

1. Step 1. Wheellock — evolved into — Flintlock. Simpler and cheaper.
2. Step 2. Flintlock — works like — Lighter. The same way of striking a spark.
3. Step 3. Lighter — evolved from — Fire making. A fire striker.
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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