Back in May, 2018, we had a post here about rice cookers. That was about a very high-end unit, but the bottom of the line products often used a remarkably clever means to cook perfect rice every time, regardless of variables such as the kind of rice, altitude, initial temperature of the water, and the exact quantities of rice and water (within reasonable limits) put into the cooker. Here is a Technology Connections video about how they did it.
Like the elegant toaster I discussed on 2019-04-24, there is no microprocessor, sensors, or complex mechanism. It’s as simple, and reliable, as the properties of magnetism in metals and phase transitions in water. I’ll not spoil the genius of the design, which is revealed toward the end of the eleven minute video.