Capillary action and telephone: what they have in common

1. Step 1. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
2. Step 2. Heat pipe — is part of — Laptop. Heat pipes.
3. Step 3. Laptop — has part — Webcam. Above the screen is a small webcam for video calls.
4. Step 4. Webcam — is used in — Video call. A webcam.
5. Step 5. Video call — evolved from — Telephone. A telephone with a picture.

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