Making ice cream with third-graders may be a fun way to pass those long days, but it can also be an exciting way to teach them about the phases of matter. Add a little liquid nitrogen, and it gets even better! Over the last 3 years BASIS volunteer Leah Witus has helped coordinate 16 classroom visits, exploring gasses, liquids, and solids with over 350 3rd grade students. “I love seeing how excited kids get from watching dry ice sublime and flowers shatter after being frozen in liquid nitrogen,” says Leah.