Water heater and sonar: what they have in common

1. Step 1. Water heater — has part — Thermostat. A thermostat.
2. Step 2. Thermostat — is part of — Rice cooker. Switching off by temperature.
3. Step 3. Rice cooker — evolved into — Multicooker. A multicooker.
4. Step 4. Multicooker — uses — Microcontroller. Programs.
5. Step 5. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
6. Step 6. Parking sensor — works like — Sonar. Echolocation in air.

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