Wool e sickle: o que têm em comum

1. Passo 1. Wool — é material para — Trousers. The oldest trousers (Yanghai) were sewn from wool.
2. Passo 2. Trousers — utiliza — Needle. Trousers were sewn with a needle.
3. Passo 3. Needle — evoluiu de — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
4. Passo 4. Stone tool — evoluiu para — Sickle. The first sickles had flint inserts.

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