Cork and shaduf: what they have in common

1. Step 1. Cork — is used in — Corkscrew. It pulls out the cork.
2. Step 2. Corkscrew — uses — Screw. A spiral.
3. Step 3. Screw — is used in — Archimedes’ screw. A rotating helical surface lifts water.
4. Step 4. Archimedes’ screw — is used in — Irrigation. The Archimedes’ screw lifted water for irrigation.
5. Step 5. Irrigation — uses — Shaduf. The shaduf fed water into the canals.

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