Assess learners' ability to evaluate which common materials best keep a toy dry by designing and interpreting simple, age-appropriate tests of waterproofing, absorbency, and strength. Tasks include identifying a fair test and variables, selecting materials (e.g., plastic, foil, fabric, paper, rubber), recording observations, comparing results, drawing evidence-based conclusions about which material best prevents water penetration, and noting safety or limitation considerations for Pre-K–Grade 2 learners.