Penicillin and rolling mill: what they have in common

1. Step 1. Penicillin — uses — Fermentation. Production by fermentation.
2. Step 2. Fermentation — is used in — Bread. Yeast dough rises through fermentation.
3. Step 3. Bread — uses — Quern. Flour was ground on millstones.
4. Step 4. Quern — evolved into — Gristmill. The mill mechanized hand-turned millstones.
5. Step 5. Gristmill — uses — Water wheel. A water wheel turns the millstones.
6. Step 6. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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