Plough e vacuum pump: o que têm em comum

1. Passo 1. Plough — evoluiu de — Hoe. The plough mechanized loosening the soil with a hoe.
2. Passo 2. Hoe — evoluiu de — Stone tool. Neolithic hoes of stone and antler.
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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