Good educational Video

This is an interesting and educational video on the four tones in Mandarin Chinese. The length of the video is about 3 and a half minutes. It starts with a quick introduction, explanations of the four tones and sums up with a review.

This video follows some basic principles of
multimedia learning environments so  that people can learn better:

1. Multimedia principle: The video uses both words (mostly spoken, and text) and pictures (graphs).
2. Split-Attention principle: The graphics of each tone marks are physically  and temporally integrated. When the teacher talks about another tone mark, the previous one disappeared.
3. Modality principle: The narration was accompanied with proper graphics and animations that help people to understand the concept better. 
4. Corresponding words (text in the lower left-hand corner) and pictures are presented near   rather than far from each other on the screen  and also in time with audio.