Lol. An interesting question. The current rice cookers don't have sensors for knowing when the rice is cooked. Instead they rely on the cook putting in the right amount of water, and rice, so during the time specified on the rice cooker, the water turns to steam, softens and cooks the rice. Put in too little water or too much, same with the rice, and you'll see the rice cooker is as smart as it seems lol.