Aerosol can and programmable logic controller: what they have in common

1. Step 1. Aerosol can — is used in — Pesticide. In 1941 insecticide began to be sprayed from aerosol cans, the "bug bombs" made for soldiers; after the war the same can was used for hair spray.
2. Step 2. Pesticide — is used in — Genetically modified crops. Pest resistance reduces the use of pesticides.
3. Step 3. Genetically modified crops — uses — Mineral fertilizer. Intensive farming combines varieties and fertilizers.
4. Step 4. Mineral fertilizer — uses — Sulfuric acid. Superphosphate is made with sulfuric acid.
5. Step 5. Sulfuric acid — is used in — Chemical plant. The first chemical plants produced sulfuric acid and soda.
6. Step 6. Chemical plant — has part — Programmable logic controller. Process control automation.

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