First, if you are looking for a charismatic or persuasive or speech topic, you must know that the more controversial the speech topic, the more response you will get from your audiences. The topic sentence has to be short, declarative sentence that states the central idea of your speech. Your persuasive speech topics should zero in on one main idea rather than focusing on entirely different areas. If you are looking for science related speech topics, there are plenty of those in the science forums. It is relatively easy to join forums. A visual presentation is sure to bring your informative speech topics to a whole new level of interest.Choosing a persuasive speech topic for your presentation is not an easy task. Introduce the topic with a statement of fact and support that statement with the main points of your speech. Write a purpose statement by stating the goal and topic for a speech and specifying the method to be used in developing the speech. This means you will have to research your topic and work your sources into your speech and outline.
The more controversial your persuasive speech topic, the harder challenge you are creating for yourself, and the more you'll learn. Interest the listeners in the topic, purpose, and issues of the speech. Developing a topic and identifying the purpose of a speech will aid in the organization and direction of the overall performance. You will get enthusiastic applause...perhaps even a standing ovation, every time you speak if you develop informative speech topics which are slightly controversial in nature! However, don’t go for total shock value. If you emphasize both the positive and negative characteristics of your topic in order to provide a well-balanced speech, you will definitely make your speech more interesting! Also, by instilling passion, you are seen as a charismatic speaker who can inspire others past their self-induced limitations.
So, the idea here is to first pick a topic and then list down the positive and negative characteristics of your topic. It will stimulate your mind in more ways than you can imagine, and could easily spawn dozens of speech topic ideas.