Nitroglycerin e knife: o que têm em comum

1. Passo 1. Nitroglycerin — é material para — Dinamite. Nitroglycerin in a porous filler.
2. Passo 2. Dinamite — evoluiu de — Gunpowder. A replacement for gunpowder in mining.
3. Passo 3. Gunpowder — é utilizado em — Lança de fogo. A gunpowder charge.
4. Passo 4. Lança de fogo — evoluiu de — Spear. The fire lance was a spear with a tube of gunpowder — the first step to firearms.
5. Passo 5. Spear — tem como parte — Stone tool. Early spearheads were made of stone.
6. Passo 6. Stone tool — evoluiu para — Knife. The first knives were stone flakes.

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