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When you get the kids to eat or soup alone, will you worry about the soups temperature is too high to burn our baby? This design uses the principle that gas expands when heated. We fill the spoon head with CO2 gas. When the soup or food is too hot, the spoon's head swells into a ball. At this time the spoon can not pick up food. When the food temperature is reduced to edible temperature, the spoon will be restored to its original form, the children can eat things.