Audio: Some good audio technologies would be audio books or recordings of lectures to put on an ipod or mp3 player. Audio isn't very popular and it is not always the most practical in my opinion. I think audio books may have a place but I feel like reading straight text doesn't teach kids. Nobody wants to learn reading the text book and frankly listening to a monotone voice over read the text book isn't much better. Of course we need textbooks and maybe when the students need to do some book studying the audio book could also be made available. I think recordings of lectures are a great way to study too. My brother listens to some lectures he downloaded on the internet on the way to class and I know runners who listen to lectures while they run. I think charismatic lectures are much more effective and interesting than audio book recordings.
Video: I think a great piece of video technology is the document camera or Elmo. Overheads are great and they get the job done but document cameras are more versatile. For example if I need to show my students how to do something on a calculator its much easier to throw it up on the document camera. Also for going over tests or homework it can be a very handy tool. I would just be careful not to use it too much because I think there is something good about a simple chalkboard.
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