Rapid test and boiler: what they have in common

1. Step 1. Rapid test — evolved from — Pregnancy test. The same strip technology.
2. Step 2. Pregnancy test — uses — Capillary action. Capillary flow of the liquid.
3. Step 3. Capillary action — is used in — Heat pipe. The liquid returns along the wick by capillary action.
4. Step 4. Heat pipe — uses — Latent heat. Evaporation and condensation.
5. Step 5. Latent heat — is used in — Boiler. Evaporation needs latent heat.

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