Cuneiform and freezer: what they have in common

1. Step 1. Cuneiform — uses — Clay. The signs were pressed into wet clay.
2. Step 2. Clay — is material for — Incubator. Egyptian incubators were clay chambers.
3. Step 3. Incubator — has part — Thermostat. Keeping the temperature.
4. Step 4. Thermostat — is part of — Freezer. A thermostat.

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