Cheese mould and railway track: what they have in common

1. Step 1. Cheese mould — is part of — Cheese press. A perforated mould.
2. Step 2. Cheese press — uses — Screw. A screw press.
3. Step 3. Screw — is used in — Archimedes’ screw. A rotating helical surface lifts water.
4. Step 4. Archimedes’ screw — has part — Crank. A handle or rotary drive.
5. Step 5. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
6. Step 6. Steam locomotive — uses — Railway track. It runs on rails.

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