Catamaran and fuel cell: what they have in common

1. Step 1. Catamaran — has part — Hull. Two hulls.
2. Step 2. Hull — uses — Archimedes’ principle. The hull displaces water.
3. Step 3. Archimedes’ principle — is used in — Weather balloon. A balloon filled with hydrogen or helium.
4. Step 4. Weather balloon — is made of — Hydrogen. Filled with hydrogen or helium.
5. Step 5. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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