Sponge and transformer: what they have in common

1. Step 1. Sponge — uses — Capillary action. It absorbs by capillary action.
2. Step 2. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
3. Step 3. Heat pipe — is part of — Laptop. Heat pipes.
4. Step 4. Laptop — evolved from — Personal computer. A portable PC.
5. Step 5. Personal computer — has part — Power supply. The power supply turns mains power into the voltages the board and drives need.
6. Step 6. Power supply — has part — Transformer. A transformer.

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