Per demo (or per group of four students each, if you are brave!)

• 4 raw eggs
• 4 drinking glasses filled with water (best if the glasses have a slightly wider top and do not taper); fill the glasses about ¾ full
• 4 rolled playing cards; roll the cards so that the shorter sides are at the top and bottom and tape shut
• 1 cafeteria-style tray or cookie sheet