Adze blade e vacuum pump: o que têm em comum

1. Passo 1. Adze blade — faz parte de — Enxó. A blade across the handle takes shavings off a log.
2. Passo 2. Enxó — evoluiu de — Stone tool. Neolithic adzes were stone.
3. Passo 3. Stone tool — evoluiu para — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
4. Passo 4. Needle — faz parte de — Syringe. A hollow needle.
5. Passo 5. Syringe — funciona como — Piston pump. A syringe is a hand-operated piston pump.
6. Passo 6. Piston pump — evoluiu para — Vacuum pump. Guericke adapted the piston pump to pump out air.

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