Blank coin disc and modem: what they have in common

1. Step 1. Blank coin disc — is part of — Coin. A metal blank.
2. Step 2. Coin — is made of — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Step 3. Gold — is material for — Glucose meter. The strip electrodes are gold or carbon.
4. Step 4. Glucose meter — uses — Electrochemical reaction. An electrochemical sensor.
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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