We learn about bacteria, the hardy organisms found everywhere:  their characteristics and parts; prokaryotes; classification by shape; reproduction; aerobic and anaerobic bacteria; bacterial infections; pathogens and white blood cells; food poisoning; pasteurization; antibiotics; bacteria in digestion and nutrition; probiotics; decomposers and cyanobacteria in the ecosystem. Detailed graphics, diagrams, video, and reviews at the end of each segment reinforce important concepts.