This is a really, really, really fun science experiment I did with my kids. You put cold water and ice into a bowl and "wrap" Crisco around the kids' fingers (only one finger - I did pointer fingers). Then they stick the Crisco pointer finger and the non-Crisco finger in at the same time to see the difference. The Crisco acts as polar bear flubber/fat. It's a really good time!
Materials: Crisco, cold water, ice, bowl, fingers, science experiment worksheet