The Ann Arbor Hands-On Museum visited our 4th graders on Halloween. They presented a hands-on S.T.E.M. activity that aligned with the student’s current science curriculum. The students started off with an oral discussion and review of the three states of matter: liquid, solid, and gas. Next the students reviewed the process of condensation and evaporation. When dry ice was introduced, students had an opportunity to watch the effects of the ice once submerged in water. Finally, they used their own pipettes and chemical solutions to create individual cups of slime. Students were given plenty of time to use 4 of their 5 senses (no tasting) to observe the slime before taking scientific notes of their observations.