Torsion balance and zip: what they have in common

1. Step 1. Torsion balance — is made of — Silver. The suspension fibre is a thin silver wire.
2. Step 2. Silver — is material for — Syringe. Early needles were silver.
3. Step 3. Syringe — has part — Needle. A hollow needle.
4. Step 4. Needle — is used in — Trousers. Trousers were sewn with a needle.
5. Step 5. Trousers — has part — Zip. A fastener.

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