Firebox and bicycle: what they have in common

1. Step 1. Firebox — is part of — Kiln. A combustion chamber.
2. Step 2. Kiln — is used in — Pottery. Firing in a kiln makes clay strong.
3. Step 3. Pottery — uses — Potter’s wheel. The wheel made shaping vessels faster and more even.
4. Step 4. Potter’s wheel — uses — Angular momentum. A heavy disc keeps spinning by inertia.
5. Step 5. Angular momentum — is used in — Bicycle. The spinning wheels and the steering geometry help keep balance.

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