Natural rubber and plough: what they have in common

1. Step 1. Natural rubber — is material for — IV drip. And rubber tubes.
2. Step 2. IV drip — has part — Syringe. A needle.
3. Step 3. Syringe — has part — Needle. A hollow needle.
4. Step 4. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
5. Step 5. Stone tool — evolved into — Hoe. Neolithic hoes of stone and antler.
6. Step 6. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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