Alarm clock and fuel cell: what they have in common

1. Step 1. Alarm clock — has part — Electric bell. A bell.
2. Step 2. Electric bell — has part — Electromagnet. An electromagnet strikes a small hammer.
3. Step 3. Electromagnet — is part of — Bubble chamber. The field bends the tracks.
4. Step 4. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
5. Step 5. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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