The teacher's manual introduces an interesting website about nanotechnology, which is the topic of Unit 3. At the site, students can not only learn what nanotech is and how it works, but also enjoy an interactive activity. What's better, they can even hear some researchers talk in English about how special nanotech is. I love the section about the potential use of nanotech in particular. Here's its URL:
http://www.nanozone.org/
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