This tornado in a jar would be a great visual for a science lesson. It is easy to make and interactive. The students can shake the jar in a circle to get the tornado formation and see its shape and how it moves. Adding "Elijah" to the jar?
60 Egg Activities for Kids- including this egg and vinegar experiment. Put the egg in vinegar, soak until the outer shell dissolves. When you take it out, it will have a squishy shell and you can play with it and jiggle it