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Tipping Point 3 is PowerPoint.  PowerPoint has caused a revolution of teaching and presenting.  It is much prettier, and livelier than the traditional chalkboard.   The major power of PowerPoint is just being found. When we taught with a chalk board at the end of the lecture we would erase the board with our lectures falling to the fall. PowerPoint on  the web allows us to re-use our lectures. In fact it allows anyone to reuse our lectures.
Tipping Point 3 is PowerPoint.  PowerPoint has caused a revolution of teaching and presenting.  It is much prettier, and livelier than the traditional chalkboard.   The major power of PowerPoint is just being found. When we taught with a chalk board at the end of the lecture we would erase the board with our lectures falling to the fall. PowerPoint on  the web allows us to re-use our lectures. In fact it allows anyone to reuse our lectures.