Alphabet and incandescent light bulb: what they have in common

1. Step 1. Alphabet — is used in — Movable type. An alphabet with few signs made typesetting worthwhile in Europe.
2. Step 2. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
3. Step 3. Clay — is material for — Oil lamp. Later — clay ones.
4. Step 4. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.

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