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Have you ever forgot drinking water when you are busy working?Have you ever found it is difficult to know when to add water for people during a meeting or at restaurant?Here we provide a new design
of cup. This "Know-water Cup" uses a special material, which will change shape according to different levels of water in the cup. The changeable shape will remind people of drinking water, protect cup from falling down and water spilling outside, and indicate the water volume.