Hand cannon and solar panel: what they have in common

1. Step 1. Hand cannon — evolved into — Cannon. A large hand cannon.
2. Step 2. Cannon — uses — Casting. Barrels were cast.
3. Step 3. Casting — is used in — Window glass. The panes were cast in moulds.
4. Step 4. Window glass — is part of — Solar panel. Tempered cover glass.

Open Evothings