Anchor shank and radio: what they have in common

1. Step 1. Anchor shank — is part of — Anchor. A rod.
2. Step 2. Anchor — is part of — Sailing ship. An anchor.
3. Step 3. Sailing ship — evolved from — Boat. Sailing ships grew out of rowing boats.
4. Step 4. Boat — uses — Archimedes’ principle. A vessel stays afloat by Archimedes’ principle.
5. Step 5. Archimedes’ principle — is used in — Weather balloon. A balloon filled with hydrogen or helium.
6. Step 6. Weather balloon — has part — Radio. A radiosonde.

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