Scythe blade e oil lamp: o que têm em comum

1. Passo 1. Scythe blade — faz parte de — Scythe. A long curved blade.
2. Passo 2. Scythe — evoluiu de — Sickle. Mowing while standing, with a long snath.
3. Passo 3. Sickle — evoluiu de — Stone tool. The first sickles had flint inserts.
4. Passo 4. Stone tool — evoluiu para — Enxó. Neolithic adzes were stone.
5. Passo 5. Enxó — é feito de — Stone. The blade of an adze was ground from stone.
6. Passo 6. Stone — é material para — Oil lamp. The first lamps were stone bowls (Lascaux).

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