The newer videos have more sophisticated drawing and recording software; he simply hasn't redone the old ones. Example: http://www.khanacademy.org/video/object

The newer videos have more sophisticated drawing and recording software; he simply hasn't redone the old ones. Example: http://www.khanacademy.org/video/object-image-height-and-distance-relationship?playlist=Physics http://www.khanacademy.org/video/object-image-height-and-dis...