Use inexpensive DNA teaching models to help students understand the structure of DNA, chromosomes, genes, and STRs (Short Tandem Repeats). Engage students through phenomenon-based learning to solve the identity of a 9/11 victim using STR profile analyses of the victim, two young boys, and their mother. Observe how to present the STR profile analysis so that it is easily understood by all students. This activity uses the historical event of the 9/11 attack to integrate biology, history, technology, and math while focusing on a human-interest story.