Video recorder and fuel cell: what they have in common

1. Step 1. Video recorder — has part — Magnetic tape. Video tape.
2. Step 2. Magnetic tape — is part of — Tape recorder. Magnetic tape.
3. Step 3. Tape recorder — has part — Electromagnet. Recording heads are electromagnets.
4. Step 4. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
5. Step 5. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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