Ambulance and shaduf: what they have in common

1. Step 1. Ambulance — evolved from — Truck. A special-purpose vehicle.
2. Step 2. Truck — uses — Shipping container. A container moves from ship to truck without being unloaded.
3. Step 3. Shipping container — works like — Pallet. Standardizing units of cargo.
4. Step 4. Pallet — is used in — Forklift. It works with pallets.
5. Step 5. Forklift — uses — Counterweight. A counterweight.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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