Smart meter and petri dish: what they have in common

1. Step 1. Smart meter — has part — Microcontroller. A microcontroller does the metering.
2. Step 2. Microcontroller — is used in — Multicooker. Programs.
3. Step 3. Multicooker — evolved from — Rice cooker. A multicooker.
4. Step 4. Rice cooker — is a kind of — Saucepan. A rice cooker is an electric pot that switches off when the rice is done.
5. Step 5. Saucepan — has part — Pot lid. A cap.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

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