Sand bags are used to build dykes for temporary flood control. Brainstorm a list of substitutes for use instead of sandbags. In Japan, water bags have been designed for this same use. Try to design a water bag. Produce some water bags and sand bags and devise a test to compare their effectiveness.
Kaleidoscopes contain equilateral triangular mirrors.
Using three pieces of mirror supplied, tape them into a triangular prism. Try to reproduce the effect of a kaleidoscope. Record your thoughts and the evidence you have in your journal. Carefully open the bag. Some one invented a machine which takes a piece of plastic, seals the back and bottom seam, blows air into the empty bag, fills it with chips, and then blows more air into it as the top is being sealed.