Heat transfer tubes and smartphone: what they have in common

1. Step 1. Heat transfer tubes — is part of — Solar water heater. They carry away heat.
2. Step 2. Solar water heater — has part — Window glass. The glass on top creates a greenhouse effect.
3. Step 3. Window glass — uses — Casting. The panes were cast in moulds.
4. Step 4. Casting — is used in — Bell. Casting.
5. Step 5. Bell — is part of — Alarm clock. A bell rings.
6. Step 6. Alarm clock — evolved into — Smartphone. The alarm clock moved into the phone.

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