Cannon carriage and stone tool: what they have in common

1. Step 1. Cannon carriage — is part of — Cannon. A carriage used as a support.
2. Step 2. Cannon — evolved from — Hand cannon. A large hand cannon.
3. Step 3. Hand cannon — evolved from — Fire lance. A metal barrel instead of bamboo.
4. Step 4. Fire lance — evolved from — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
5. Step 5. Spear — has part — Stone tool. Early spearheads were made of stone.

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