In this week science class, we are solving a problem about how to solve the problem that how to keep a mug warm for ten-minute, so we use a waterproof EVA Foam and a string to keep it warm first, so we need to attach the string with the lid, and it can keep it warm. we are very surprised and proud that our project that the temperature got higher two times! And the hardest thing about this project is that the size of the lid and cutting it because if it too big it will not fit and when it is smaller our project will drown it to the hot water so it is the hardest.