When we prepare for the presentation, there are some thing that we need to care.
One is use visuals like pictures, photos, graphs or videos. It will make presentation better and we can get more attention from listers. But when we use video, it should be around 2 minutes. 2 minutes is the best time that get more attention and don't lose attention from listeners.
This is a document of the presentation that I made today in the class
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https://docs.google.com/present/edit?id=0AQryTvOmQHnaZGQ2eHBjNjhfNnZma3Z3OGRy&hl=en