DVD and piston pump: what they have in common

1. Step 1. DVD — has part — Reflective metal layer. A metal coating.
2. Step 2. Reflective metal layer — is part of — Wall mirror. A silver or aluminium coating.
3. Step 3. Wall mirror — is made of — Silver. Silvering.
4. Step 4. Silver — is material for — Syringe. Early needles were silver.
5. Step 5. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.

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