Rubber eraser block and stone tool: what they have in common

1. Step 1. Rubber eraser block — is part of — Eraser. Rubber or PVC with an abrasive.
2. Step 2. Eraser — is made of — Natural rubber. Rubber.
3. Step 3. Natural rubber — is material for — IV drip. And rubber tubes.
4. Step 4. IV drip — has part — Syringe. A needle.
5. Step 5. Syringe — has part — Needle. A hollow needle.
6. Step 6. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.

Open Evothings