Smartwatch and sonar: what they have in common

1. Step 1. Smartwatch — has part — Touch layer (capacitive). A touchscreen.
2. Step 2. Touch layer (capacitive) — is part of — Display. Under the glass is a touch layer that registers touches.
3. Step 3. Display — is part of — Monitor. The heart of a monitor is the display: an LCD panel, once a picture tube.
4. Step 4. Monitor — is part of — Ultrasound scanner. A screen.
5. Step 5. Ultrasound scanner — works like — Sonar. A medical sonar: the same echo principle.

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