As teachers, one of our goals is to get our students thinking and asking questions. But what does it mean to "think like a scientist?" A key component is critical thinking. Materials that help your students to actively consider information, assess the validity of data, and form their own conclusions are an ideal way to bring critical thinking into your classroom. Whether they're trying to figure out why the beads float at different heights in our Poly Density Kit or wondering what scientific principles are at work with our Atmospheric Mat, your students are bound to improve their critical thinking skills as well as their understanding of scientific phenomena. We agree with the scholar who wrote, "The value of science education might not always be in the facts, but in the thinking."