Coil spring and greenhouse: what they have in common

1. Step 1. Coil spring — uses — Elasticity. It works through elasticity.
2. Step 2. Elasticity — is used in — Torsion balance. The twisting of a fibre.
3. Step 3. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
4. Step 4. Silver — is material for — Wall mirror. Silvering.
5. Step 5. Wall mirror — has part — Window glass. Sheet glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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