Cast-iron pan and smart meter: what they have in common

1. Step 1. Cast-iron pan — evolved into — Non-stick pan. A frying pan.
2. Step 2. Non-stick pan — is made of — Teflon. A Teflon coating.
3. Step 3. Teflon — is material for — Bread machine. A non-stick coating.
4. Step 4. Bread machine — uses — Microcontroller. Programs.
5. Step 5. Microcontroller — is part of — Smart meter. A microcontroller does the metering.

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