Refrigerator condenser coil and gutenberg printing press: what they have in common

1. Step 1. Refrigerator condenser coil — is part of — Freezer. It gives off heat to the outside.
2. Step 2. Freezer — has part — Thermostat. A thermostat.
3. Step 3. Thermostat — is part of — Incubator. Keeping the temperature.
4. Step 4. Incubator — is made of — Clay. Egyptian incubators were clay chambers.
5. Step 5. Clay — is material for — Movable type. Bi Sheng’s type was made of fired clay.
6. Step 6. Movable type — is part of — Gutenberg printing press. Text is set from metal type.

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