Dental drill and cannon: what they have in common

1. Step 1. Dental drill — has part — Turbine. An air-driven turbine handpiece.
2. Step 2. Turbine — is part of — Ocean liner. Large liners run on steam turbines.
3. Step 3. Ocean liner — evolved from — Screw steamship. A large steamship.
4. Step 4. Screw steamship — includes — Ironclad. An ironclad is a steamship clad in armour.
5. Step 5. Ironclad — has part — Cannon. Artillery.

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