DNA double helix and sickle: what they have in common

1. Step 1. DNA double helix — is used in — Recombinant DNA. Working with DNA.
2. Step 2. Recombinant DNA — is used in — Insulin. Genetically engineered since 1982.
3. Step 3. Insulin — uses — Syringe. Injections.
4. Step 4. Syringe — has part — Needle. A hollow needle.
5. Step 5. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.
6. Step 6. Stone tool — evolved into — Sickle. The first sickles had flint inserts.

Open Evothings