Phone line jack and dewar flask: what they have in common

1. Step 1. Phone line jack — is part of — Modem. Connection to the telephone line.
2. Step 2. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
3. Step 3. Digital signal processor — is part of — Doppler radar. It picks out the Doppler shift.
4. Step 4. Doppler radar — has part — Magnetron. Or a klystron — the transmitter.
5. Step 5. Magnetron — uses — Vacuum. It works in a vacuum.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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