Modem chip and electronic calculator: what they have in common

1. Step 1. Modem chip — is part of — Modem. It turns bits into tones and back.
2. Step 2. Modem — is part of — Fax. It transmits an image over a telephone line.
3. Step 3. Fax — uses — Electrochemical reaction. The paper darkened under current.
4. Step 4. Electrochemical reaction — is used in — Alkaline battery. An electrochemical reaction.
5. Step 5. Alkaline battery — is part of — Electronic calculator. A calculator runs on a battery, sometimes on a tiny solar panel.

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