Laws of heredity and rock drill: what they have in common

1. Step 1. Laws of heredity — evolved into — DNA double helix. The physical carrier of heredity.
2. Step 2. DNA double helix — is used in — Recombinant DNA. Working with DNA.
3. Step 3. Recombinant DNA — is used in — Insulin. Genetically engineered since 1982.
4. Step 4. Insulin — is used in — Insulin pump. It doses insulin.
5. Step 5. Insulin pump — has part — Piston. The reservoir’s plunger.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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