Surfactant and electrical telegraph: what they have in common

1. Step 1. Surfactant — is used in — Synthetic detergent. Surfactants.
2. Step 2. Synthetic detergent — is used in — Washing machine. Detergent powder.
3. Step 3. Washing machine — has part — Ball bearing. Drum bearings.
4. Step 4. Ball bearing — is part of — Electric generator. Shaft bearings.
5. Step 5. Electric generator — has part — Copper wire. Windings.
6. Step 6. Copper wire — is part of — Electrical telegraph. Communication lines.

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