Laser cutting and modem: what they have in common

1. Step 1. Laser cutting — uses — Laser. A laser.
2. Step 2. Laser — is used in — LIGO. A laser.
3. Step 3. LIGO — has part — Photodiode. A photodetector of the interference.
4. Step 4. Photodiode — is used in — Fax. Scanning with a photocell.
5. Step 5. Fax — has part — Modem. It transmits an image over a telephone line.

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