Grenade e knife: o que têm em comum

1. Passo 1. Grenade — utiliza — Gunpowder. An explosive.
2. Passo 2. Gunpowder — é utilizado em — Lança de fogo. A gunpowder charge.
3. Passo 3. Lança de fogo — evoluiu de — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
4. Passo 4. Spear — tem como parte — Stone tool. Early spearheads were made of stone.
5. Passo 5. Stone tool — evoluiu para — Knife. The first knives were stone flakes.

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