Thermostat and gyroscope: what they have in common

1. Step 1. Thermostat — is part of — Incubator. Keeping the temperature.
2. Step 2. Incubator — is made of — Clay. Egyptian incubators were clay chambers.
3. Step 3. Clay — is material for — Spinning top. Or shaped from clay.
4. Step 4. Spinning top — works like — Gyroscope. A gyroscope is a top in a gimbal.

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