In this part they can find a few links that were leading them to visualizing some videoes on the systems, which present a brief idea of the matter in general:
1. http://www.youtube.com/watch?v=D-1t03TRbPc
2. http://www.youtube.com/watch?v=epWWqu3gIy4
3. http://www.youtube.com/watch?v=1FX4zco0ziY
I hope that they like these videoes.
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