Margarine and modem: what they have in common

1. Step 1. Margarine — uses — Hydrogenation. Hydrogenated oils.
2. Step 2. Hydrogenation — uses — Hydrogen. Hydrogen.
3. Step 3. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.
4. Step 4. Fuel cell — uses — Electrochemical reaction. The reaction runs electrochemically, without combustion.
5. Step 5. Electrochemical reaction — is used in — Fax. The paper darkened under current.
6. Step 6. Fax — has part — Modem. It transmits an image over a telephone line.

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