Can you make an egg float without changing its mass or weight? Students find out in this hands-on, NGSS-aligned lab!This engaging 2-part activity bundle helps middle schoolers master the critical — and commonly confused — concepts of mass, weight, density, and buoyancy. Students take structured notes, compare properties in a Venn diagram, conduct a step-by-step salt water lab, and write a scientific summary. Perfect as an introduction to density or a standalone properties-of-matter investigation