Recombinant DNA and rope: what they have in common

1. Step 1. Recombinant DNA — is used in — Insulin. Genetically engineered since 1982.
2. Step 2. Insulin — uses — Syringe. Injections.
3. Step 3. Syringe — has part — Needle. A hollow needle.
4. Step 4. Needle — is made of — Bone. The first needles with an eye were carved from bone.
5. Step 5. Bone — is material for — Harpoon. The oldest harpoons (Katanda, ~90,000 years ago) are carved from bone.
6. Step 6. Harpoon — has part — Rope. A line connects the head to the hunter.

Open Evothings