Haemostat and plough: what they have in common

1. Step 1. Haemostat — evolved from — Surgical forceps. A clamp with a lock.
2. Step 2. Surgical forceps — uses — Elasticity. The jaws open by elasticity.
3. Step 3. Elasticity — is used in — Leaf spring. The leaves bend and spring back.
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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