Laser surgery and newcomen engine: what they have in common

1. Step 1. Laser surgery — uses — Laser. A laser.
2. Step 2. Laser — is used in — LIGO. A laser.
3. Step 3. LIGO — uses — Vacuum. 4 km vacuum tubes.
4. Step 4. Vacuum — is used in — Newcomen engine. Condensing the steam creates a vacuum under the piston.

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