Protective lacquer layer and refrigerator: what they have in common

1. Step 1. Protective lacquer layer — is part of — Compact disc. A coating over the reflective layer.
2. Step 2. Compact disc — uses — Binary number system. Sound is recorded as numbers.
3. Step 3. Binary number system — is used in — Barcode. The bars encode digits.
4. Step 4. Barcode — is used in — Supermarket. Barcodes.
5. Step 5. Supermarket — uses — Refrigerator. Refrigerated displays.

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