Torsion balance and typewriter: 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 — Coin. Silver coins.
3. Step 3. Coin — evolved into — Paper money. A replacement for metal money.
4. Step 4. Paper money — uses — Woodblock printing. Printed from blocks.
5. Step 5. Woodblock printing — evolved into — Movable type. Bi Sheng replaced the solid block with individual pieces of type.
6. Step 6. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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