Polio vaccine and kiln: what they have in common

1. Step 1. Polio vaccine — is a kind of — Vaccine. A vaccine.
2. Step 2. Vaccine — uses — Syringe. Injections.
3. Step 3. Syringe — works like — Piston pump. A syringe is a hand-operated piston pump.
4. Step 4. Piston pump — is used in — Greek fire. It was projected by a siphon pump.
5. Step 5. Greek fire — uses — Combustion. It burns even on water.
6. Step 6. Combustion — is used in — Kiln. Heat comes from burning fuel.

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