Oil refining and modem: what they have in common

1. Step 1. Oil refining — uses — Catalysis. Cracking and reforming use catalysts.
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 — has part — Modem. It transmits an image over a telephone line.

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