Soap and truck: what they have in common

1. Step 1. Soap — evolved into — Synthetic detergent. Synthetic detergents were invented in the First World War, when fat for soap ran short.
2. Step 2. Synthetic detergent — is used in — Washing machine. Detergent powder.
3. Step 3. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Shock absorber — is part of — Suspension. Shock absorbers are part of the suspension.
5. Step 5. Suspension — evolved from — Leaf spring. Car suspension inherited carriage leaf springs.
6. Step 6. Leaf spring — is part of — Truck. Leaf-spring suspension.

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