Haber–Bosch process and telephone: what they have in common

1. Step 1. Haber–Bosch process — uses — Catalysis. An iron catalyst.
2. Step 2. Catalysis — is used in — Fuel cell. A platinum catalyst.
3. Step 3. Fuel cell — uses — Electrochemical reaction. The reaction runs electrochemically, without combustion.
4. Step 4. Electrochemical reaction — is used in — Fax. The paper darkened under current.
5. Step 5. Fax — uses — Telephone. Transmission over a telephone line.

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