This understanding focuses primarily on teams working together and secondarily, on the combination of scientists and engineer teams. 4EST2.4 Women and men of all ages, backgrounds, and groups engage in a variety of scientific and technological work. Tools help scientists make better observations, measurements, and equipment for investigations. They help scientists see, measure, and do things that they could not otherwise see, measure and do. 4EST3.2 Objects can be categorized into two groups, natural and designed.
Safety involves freedom from danger, risk, or injury.
Security involves feelings of confidence and lack of anxiety and fear. Student understandings include following safety rules for home and school, preventing abuse and neglect, avoiding injury, knowing whom to ask for help, and when and how to say no. Understandings include how communicable diseases, such as colds, are transmitted and some of the body's defense mechanisms that prevent or overcome illness. Students should understand how the body uses food and how various foods contribute to health. Recommendations for good nutrition include eating a variety of foods, eating less sugar, and eating less fat.