Detail clutters a presentation, and in scientific talks this gets even worse. Scientist and researchers think that detail convinces an audience. I disagree. In this post I discuss how focus helps avoid unnecessary detail. After I wrote about the problems with too much detail in presentations, I have started to grow more and more wary about it. Two things that lead to too much detail are lack of preparation and unfamiliarity with the content. One solution to these problems is focus. Focus on the audience, where do you want to take to audience? Why should they come with you? What's in there for them? Be ready to answer the "so what?" question. In case you are a graduate student or a professor at a conference, you might want the audience to spend their time analyzing your idea, to alert on possible errors or to suggest possible improvement; you want to raise awareness about your research. If you dip your audience in detail and clutter, they might not be able to differen