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"As long as aviation pioneers tried to mimic birds, controlled, heavier-than-air human flight proved impossible. Along somewhat similar lines, it is only by breaking decisively from traditional face-to-face models that it will be truly possible to create the kinds of immersive, social experiences in online education that will truly engage students and promote high levels of attainment among broad profiles of students."

With apologies for the title -- some interesting graphs here that demonstrate the level of engagement at various video lengths. Makes the case for short videos. One thing that doesn't seem to be considered is how the video is integrated (or not) with learning activities.