Darts and laser: what they have in common

1. Step 1. Darts — evolved from — Bow and arrow. Accuracy of shooting.
2. Step 2. Bow and arrow — uses — Elasticity. A bow stores the energy of elastic deformation and releases it into the arrow.
3. Step 3. Elasticity — is used in — Torsion balance. The twisting of a fibre.
4. Step 4. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
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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