Synthetic detergent and saw: what they have in common

1. Step 1. Synthetic detergent — is used in — Washing machine. Detergent powder.
2. Step 2. Washing machine — evolved from — Mangle. Early machines had rollers for wringing.
3. Step 3. Mangle — has part — Crank. A handle.
4. Step 4. Crank — is part of — Sawmill. A crank turns the wheel’s rotation into the stroke of the saw.
5. Step 5. Sawmill — uses — Saw. The cutting tool is a saw.

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