Sílex e headphones: o que têm em comum

1. Passo 1. Sílex — é material para — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.
2. Passo 2. Stone tool — evoluiu para — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
3. Passo 3. Needle — é feito de — Osso. The first needles with an eye were carved from bone.
4. Passo 4. Osso — é material para — Freio e bridão. Early cheekpieces were carved from antler and bone.
5. Passo 5. Freio e bridão — tem como parte — Headband. Straps on the head.
6. Passo 6. Headband — faz parte de — Headphones. A band that presses the cups.

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