Candle and electronic calculator: what they have in common

1. Step 1. Candle — has part — Wick. A candle’s wick.
2. Step 2. Wick — uses — Capillary action. Fuel rises up the wick by capillary forces.
3. Step 3. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
4. Step 4. Heat pipe — is part of — Laptop. Heat pipes.
5. Step 5. Laptop — has part — Liquid-crystal display. An LCD screen.
6. Step 6. Liquid-crystal display — is part of — Electronic calculator. An LCD display.

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