Every student must contribute something that will improve the course for students in the future. Usually this will be making a multimedia presentation of about 3 minutes. The presentation should explain one of the topics covered in the course and it should be better than the audio recording of the lecture for that topic. This will typically consist of 2-3 slides with equations or images and the corresponding audio or video files. The presentation will be posted on the course website. The easist way to contribute a presentation to the course is to first update it to YouTube.