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Everyone is familiar with foot warmers, right? Foot warmers provide us with warmth in winter. I still remember the days before laptops. When I was sitting in front of a desktop computer playing online games or working all night long, I relied on the foot warmers to protect my feet from the cold. When my feet were warm, my whole body would be warm as well. Although laptops and mobile phones have now replaced bulky and immobile desktops, and we can surf the Internet and play games while sitting in bed, the foot warmer is still my good partner. The heating temperature of the foot warmer is controlled to be slightly higher than the body temperature. This temperature makes our feet comfortable and also makes lactic acid bacteria like it very much. The most suitable fermentation temperature of lactic acid bacteria is 30~40℃. So, let’s give the foot warmer a new function and use it to make homemade yogurt!
