Smartphone and greenhouse: what they have in common

1. Step 1. Smartphone — evolved from — Alarm clock. The alarm clock moved into the phone.
2. Step 2. Alarm clock — has part — Bell. A bell rings.
3. Step 3. Bell — uses — Casting. Casting.
4. Step 4. Casting — is used in — Window glass. The panes were cast in moulds.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

Open Evothings