Surgical mask and rolling mill: what they have in common

1. Step 1. Surgical mask — is made of — Cotton. Mikulicz’s masks were gauze.
2. Step 2. Cotton — is used in — Arkwright’s water frame. It spins cotton.
3. Step 3. Arkwright’s water frame — has part — Water wheel. Driven by water.
4. Step 4. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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