Sternpost rudder and refrigerator: what they have in common

1. Step 1. Sternpost rudder — is a kind of — Rudder. A kind of rudder.
2. Step 2. Rudder — is part of — Sailing ship. A steering wheel.
3. Step 3. Sailing ship — has part — Anchor. An anchor.
4. Step 4. Anchor — is made of — Stone. The oldest anchors were stones with a hole.
5. Step 5. Stone — is material for — Ice house. Ice houses were built of stone and sunk into the ground.
6. Step 6. Ice house — evolved into — Refrigerator. The refrigerator replaced natural ice.

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