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. Objects can be categorized into two groups, natural and designed. Personal Health Safety and security are basic needs of humans.
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. Individuals have some responsibility for their own health. Understandings include how communicable diseases, such as colds, are transmitted and some of the body's defense mechanisms that prevent or overcome illness. Nutrition is essential to health.