How can something so small play such a big role in our lives? This interactive CD-ROM lets students explore the interactive CD-ROM lets students explore the interaction between microscopic bacteria and humans. Build a colony of bacteria, write about the issue of biological warfare, learn about the overuse of antibiotics, or read encyclopedia articles about bacteria. Have students do a data base activity with gram-positive and gram negative bacteria. Include 5 to 10 minutes of discovery channel video Adventures. Simulations include Bacteria / Viral growth, Cell Division and food and Nutrition.