Fill a clean mayonnaise or pickle jar one-half full with soybeans. Add fine textured sand. Shake the jar until the beans and sand are evenly distributed and the contents fill the jar to the top. Place the jar on a pan at the front of the class. At the start of class, ask students to present hypotheses as to what will happen when the contents are completely saturated with water. List the predictions on the board. Fill the jar with water as you collect the student hypotheses. Use warm water to speed the process. Within 30 to 45 minutes, expect the glass to crack due to the build up of osmotic pressure caused by the seeds’ imbibition of water.