Curved sickle blade and syringe: what they have in common

1. Step 1. Curved sickle blade — is part of — Sickle. A semicircular blade gathers the stems to the cut.
2. Step 2. Sickle — evolved from — Stone tool. The first sickles had flint inserts.
3. Step 3. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
4. Step 4. Needle — is part of — Syringe. A hollow needle.

Open Evothings