Barbed wire and laser: what they have in common

1. Step 1. Barbed wire — uses — Wire drawing. Wire is made by drawing.
2. Step 2. Wire drawing — is used in — Copper wire. Drawing.
3. Step 3. Copper wire — uses — Electrical conduction. Copper conducts current well.
4. Step 4. Electrical conduction — is used in — Silver. The best conductor.
5. Step 5. Silver — is material for — Mirror. A silver coating.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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