Wheellock and personal computer: what they have in common

1. Step 1. Wheellock — evolved into — Flintlock. Simpler and cheaper.
2. Step 2. Flintlock — works like — Lighter. The same way of striking a spark.
3. Step 3. Lighter — uses — Piezoelectric effect. Piezo lighters.
4. Step 4. Piezoelectric effect — is used in — Ultrasound scanner. A piezo transducer.
5. Step 5. Ultrasound scanner — has part — Monitor. A screen.
6. Step 6. Monitor — is part of — Personal computer. A monitor.

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