Photolithography and fuel cell: what they have in common

1. Step 1. Photolithography — evolved from — Camera. A photographic process carried over to silicon.
2. Step 2. Camera — is part of — Bubble chamber. Photographing the tracks.
3. Step 3. Bubble chamber — is made of — Hydrogen. The working medium is superheated liquid hydrogen.
4. Step 4. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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