Atomic Candy Activity (Radioactive Decay of Candium) Radioactive decay processes occur in accordance with first order kinetics. This simulation provides a simple example of the rate at which a radioactive isotope decays. Contact: science_house@ncsu.edu Phone: 919-515-6118 Grades: 5th - 11th Availability: Nationally Dirty Water Project Civil, chemical and environmental engineers work together to make existing water treatment systems better, or to develop new water treatment systems. Some engineers design state-of-the-art seawater treatment system technologies that take water from the ocean and process it cost-effectively for safe domestic use. In this activity, students investigate different methods (aeration and filtering) for removing pollutants from water. They will design and build their own water filters. Contact: TeachEngineering@lists.colorado.edu Grades: 3rd - 5th Availability: Nationally Harmless Holder Invent a holder for six cans that's animal-safe, sturdy, convenient, and easy to carry. Contact: No direct contact information is available, however linking permissions/guidelines are directly available on the site. Grades: 4th - 7th Availability: Nationally