BBS and computer: what they have in common

1. Step 1. BBS — uses — Modem. Access by modem.
2. Step 2. Modem — is part of — Fax. It transmits an image over a telephone line.
3. Step 3. Fax — uses — Photodiode. Scanning with a photocell.
4. Step 4. Photodiode — is part of — PET scanner. Photodetectors register the scintillations.
5. Step 5. PET scanner — uses — Computer. Reconstruction.

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