Pressure fuze e stone tool: o que têm em comum

1. Passo 1. Pressure fuze — faz parte de — Landmine. Triggered by pressure.
2. Passo 2. Landmine — utiliza — Gunpowder. Chinese mines of the 13th century were filled with gunpowder.
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.

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