Neutron and oil lamp: what they have in common

1. Step 1. Neutron — is a kind of — Atomic nucleus. A particle of the nucleus.
2. Step 2. Atomic nucleus — is used in — Isotopes. Different numbers of neutrons.
3. Step 3. Isotopes — is used in — Mass spectrometer. It discovered the isotopes of stable elements.
4. Step 4. Mass spectrometer — uses — Vacuum. Ions fly in a vacuum.
5. Step 5. Vacuum — is used in — Incandescent light bulb. The bulb was evacuated so the filament would not burn out.
6. Step 6. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.

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