Alfabeto e incandescent light bulb: o que têm em comum

1. Passo 1. Alfabeto — é utilizado em — Movable type. An alphabet with few signs made typesetting worthwhile in Europe.
2. Passo 2. Movable type — é feito de — Argila. Bi Sheng’s type was made of fired clay.
3. Passo 3. Argila — é material para — Oil lamp. Later — clay ones.
4. Passo 4. Oil lamp — evoluiu para — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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