Rice cookers have been dated back to 1250 BC. Throughout their long history many revisions to styling and materials, yet the main components remain in some form even today: a cooking bowl and a heating source. Modern technology improved upon this concept to include a thermostat in order to regular the cooking temperature.
A rice cooker will boil or steam your rice for consumption. Certain models of rice cookers perform this with additional sensors in order to provide a more controlled and repeatable cooking process.
Further still, some rice cookers have adapted to cook more than just rice through use of additional components.
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