Usenet and mechanical clock: what they have in common

1. Step 1. Usenet — uses — Modem. The first nodes were linked by modems.
2. Step 2. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
3. Step 3. Digital signal processor — is part of — Ultrasound scanner. Forming the image.
4. Step 4. Ultrasound scanner — uses — Piezoelectric effect. A piezo transducer.
5. Step 5. Piezoelectric effect — is used in — Quartz clock. The quartz resonator vibrates thanks to the piezoelectric effect.
6. Step 6. Quartz clock — evolved from — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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