Find five instructional units on cells: levels of organization, interacting with the outside world, creating energy for the cell, coding and translating instructions, and making protein "machinery" to do things. Each unit is broken down into sections: "why does it matter," "how we find out," "what we know," "story time," "activities," "hazards," and "get smart." The units contain facts, graphics, interactive flash cards, links, and lesson plans.