Sewing machine and laser: what they have in common

1. Step 1. Sewing machine — has part — Needle. A needle with the eye near its point.
2. Step 2. Needle — is part of — Syringe. A hollow needle.
3. Step 3. Syringe — is made of — Silver. Early needles were silver.
4. Step 4. Silver — is material for — Mirror. A silver coating.
5. Step 5. Mirror — is part of — Laser. A resonator made of mirrors.

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