Thermometer and modem: what they have in common

1. Step 1. Thermometer — is part of — Weather station. A thermometer.
2. Step 2. Weather station — is used in — Weather forecast. Observations.
3. Step 3. Weather forecast — uses — Doppler radar. Weather radars.
4. Step 4. Doppler radar — has part — Digital signal processor. It picks out the Doppler shift.
5. Step 5. Digital signal processor — is part of — Modem. Signal processing in high-speed modems.

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