Capillary action and joystick: 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 — Solid-state drive. A drive.
4. Step 4. Solid-state drive — has part — Microcontroller. A controller manages the memory.
5. Step 5. Microcontroller — is part of — Gamepad. A microcontroller polls the buttons.
6. Step 6. Gamepad — evolved from — Joystick. A game controller.

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