Shopping trolley and kiln: what they have in common

1. Step 1. Shopping trolley — has part — Wheel. Wheels.
2. Step 2. Wheel — works like — Potter’s wheel. A potter’s wheel is a spinning disc; it is sometimes seen as a forerunner of the transport wheel.
3. Step 3. Potter’s wheel — is used in — Pottery. The wheel made shaping vessels faster and more even.
4. Step 4. Pottery — uses — Kiln. Firing in a kiln makes clay strong.

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