Musket and electronic calculator: what they have in common

1. Step 1. Musket — evolved from — Hand cannon. A hand-held gun.
2. Step 2. Hand cannon — evolved into — Cannon. A large hand cannon.
3. Step 3. Cannon — uses — Casting. Barrels were cast.
4. Step 4. Casting — is used in — Window glass. The panes were cast in moulds.
5. Step 5. Window glass — is part of — Solar panel. Tempered cover glass.
6. Step 6. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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