Implosion explosive lens and LIGO: what they have in common

1. Step 1. Implosion explosive lens — is part of — Nuclear weapon. It compresses the core with an explosion.
2. Step 2. Nuclear weapon — uses — Uranium. Uranium-235 or plutonium.
3. Step 3. Uranium — uses — Isotopes. Uranium-235 and uranium-238.
4. Step 4. Isotopes — is used in — Mass spectrometer. It discovered the isotopes of stable elements.
5. Step 5. Mass spectrometer — uses — Vacuum. Ions fly in a vacuum.
6. Step 6. Vacuum — is used in — LIGO. 4 km vacuum tubes.

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