Yeast and rolling mill: what they have in common

1. Step 1. Yeast — is material for — Bread. A raising agent that releases carbon dioxide.
2. Step 2. Bread — uses — Quern. Flour was ground on millstones.
3. Step 3. Quern — evolved into — Gristmill. The mill mechanized hand-turned millstones.
4. Step 4. Gristmill — uses — Water wheel. A water wheel turns the millstones.
5. Step 5. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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