Show students how our understanding of matter has evolved with this States of Matter Timeline Project. Designed for grades 4β6, this hands-on activity combines history, science, and art as learners research and create a 36-inch timeline of famous experiments in chemistry and physics. Students place key discoveries about solids, liquids, gases, and plasma along the timeline, including contributions from scientists such as Robert Boyle, Joseph Priestley, Antoine Lavoisier, Dmitri Mendeleev, M