Don't be worried if the person you're talking to exclaims "No!" at something you've said. He or she isn't disagreeing but is showing polite interest in what is being discussed. People stand close in front of each other, and maintain steady eye contact. Brazilians may not want to talk about their own personal lives, for example their position in a company, their income, religion, family, but they may ask you personal questions of this kind! Also, stay away from topics such as economic and environmental problems, ethnic and class differences, and politics, but feel free to talk about food, Brazilian music and arts, and soccer and other sports.