In making tea or coffee, as in trimming the bangs, has its own nuances and essential criteria, failure of which will affect the final result. Care must be struck between not cooling the drink too much and without trimming bangs too short and burning mouth coffee will not bring any pleasure, as well as bangs covering her eyes. To solve the problem of the "ideal coffee" helps project Coffee Joulies, metal device in the form of a huge grain of coffee, which will regulate the temperature of the drink, then cooling it, then heating up again.