Radiation therapy and oil well: what they have in common

1. Step 1. Radiation therapy — uses — Medical linear accelerator. Treatment.
2. Step 2. Medical linear accelerator — uses — Vacuum. Electrons fly in a vacuum.
3. Step 3. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.
4. Step 4. Newcomen engine — has part — Boiler. Steam from the boiler.
5. Step 5. Boiler — is made of — Wrought iron. Later — made of sheet wrought iron.
6. Step 6. Wrought iron — is material for — Oil well. The casing pipes are iron.

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