Fax and personal computer: what they have in common

1. Step 1. Fax — uses — Photodiode. Scanning with a photocell.
2. Step 2. Photodiode — is part of — Image sensor. A sensor pixel is a photodiode.
3. Step 3. Image sensor — is part of — Computer mouse. The motion sensor is a tiny camera.
4. Step 4. Computer mouse — is part of — Personal computer. A mouse.

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