Water-jet propulsion and LIGO: what they have in common

1. Step 1. Water-jet propulsion — has part — Impeller. An impeller.
2. Step 2. Impeller — is part of — Vacuum cleaner. An impeller creates the suction.
3. Step 3. Vacuum cleaner — evolved into — Robot vacuum. An autonomous vacuum cleaner.
4. Step 4. Robot vacuum — has part — Lidar. Navigation by lidar.
5. Step 5. Lidar — has part — Photodiode. A receiver of reflected light.
6. Step 6. Photodiode — is part of — LIGO. A photodetector of the interference.

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