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The Bacteria Files Invasion Discovery Channel School (Invasion)
The Bacteria Files Invasion Discovery Channel School - Invasion Bacteria. Ugh! They're bad for us, right? Well, acturally, not all bacteria are bad. In fact, the great majority of them are friends. More than 1600 species have been identified so far, and scientists are discovering new ones each day. The Bacteria Files Discovery Channel tells you bacteria's long sometimes complicated story. It goes back a few ... more »billion years, so make yourself comfortable. And be sure to wash you hands when you through. For science teachers and students in grades 5-9, Science Collections offer teachers a broad assortment of info.« less