Sensor and laser: what they have in common

1. Step 1. Sensor — includes — Smoke detector. A sensor.
2. Step 2. Smoke detector — has part — Photodiode. An optical scattering sensor.
3. Step 3. Photodiode — is part of — LIGO. A photodetector of the interference.
4. Step 4. LIGO — uses — Laser. A laser.

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