Gas lamp and particle accelerator: what they have in common

1. Step 1. Gas lamp — evolved into — Incandescent light bulb. Electricity displaced gas lighting.
2. Step 2. Incandescent light bulb — uses — Vacuum. The bulb was evacuated so the filament would not burn out.
3. Step 3. Vacuum — is used in — Particle accelerator. A vacuum chamber.

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