Lightning rod spike and modem: what they have in common

1. Step 1. Lightning rod spike — is part of — Lightning rod. A rod above the roof.
2. Step 2. Lightning rod — uses — Electrical conduction. It carries the current into the ground.
3. Step 3. Electrical conduction — is used in — Antenna. Current in a conductor radiates a wave.
4. Step 4. Antenna — is part of — Doppler radar. An antenna.
5. Step 5. Doppler radar — has part — Digital signal processor. It picks out the Doppler shift.
6. Step 6. Digital signal processor — is part of — Modem. Signal processing in high-speed modems.

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