Plastic brick shell and syringe: what they have in common

1. Step 1. Plastic brick shell — is part of — LEGO bricks. A thin-walled ABS plastic shell.
2. Step 2. LEGO bricks — uses — Elasticity. The grip relies on the elastic deformation of the plastic.
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 — Syringe. Early needles were silver.

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