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Genetics and the passing of traits from parents to children is one of the topics in middle school  and high school science that I've often seen students take a personal interest in learning. In the following TED-Ed lesson How Mendel's Pea Plants Helped Us Understand Genetics, students receive a crash course in heredity, genotypes, and punnett squares through the story of Mendel and his study of peas. The full lesson with questions is available here.

Squishy Circuits is a project developed at the University of St. Thomas for the purpose of creating tools that students can use to create circuits and explore electronics. Squishy Circuits uses Playdough-like to enable hands-on learning about conducting and insulating currents as well as creating circuits. The Squishy Circuits website provides directions for creating the dough and offers ideas for lessons using the dough. Watch this TED Talk for an explanation and demonstration of Squishy Circuits.

8th grade science