Charging station and plough: what they have in common

1. Step 1. Charging station — is used in — Electric car. It charges at charging stations.
2. Step 2. Electric car — has part — Suspension. The suspension is the same as in an ordinary car.
3. Step 3. Suspension — evolved from — Leaf spring. Car suspension inherited carriage leaf springs.
4. Step 4. Leaf spring — is part of — Stagecoach. Leaf springs.
5. Step 5. Stagecoach — uses — Horse collar. It is pulled by horses.
6. Step 6. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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