Place a slice of bread in a Tupperware container and secure the lid in place. Place a second slice of bread in a Tupperware container, but leave the lid off. Place both containers in a safe location. Observe the bread in the containers every 24 hours, and take note of which slice stays the freshest, and which dries out or develops mold more quickly. Repeat the experiment with sliced vegetables, fruit or other food samples.
Fill a Tupperware container with a sample food of your choice. Examples include soup, fruit, meat and vegetables. Secure the lid in place, and place an identical amount of the sample food in a plastic zip-close bag. Freeze both the Tupperware container and the plastic bag for at least 24 hours. Remove the frozen samples from the freezer and place them in a large bowl or sink full of hot water. Observe which sample thaws more quickly, the sample in the Tupperware container or the sample in the plastic bag.
Fill an ice cube tray with tap water. Add a drop of blue food coloring to each ice cube compartment. Freeze the ice cubes until they are solid. Fill a Tupperware container with hot water, and add a couple drops of red food coloring to the right hand side of the Tupperware container. Drop the blue ice cubes into the left hand side of the container. Observe what happens to the hot water, represented by red water, and the cold water, represented by blue water. Consider how similar reactions exist in ocean and weather currents.
Fill a Tupperware container about halfway full with sugar. Add several drops of water to the sugar. Secure the lid in place. Place the Tupperware container outside, preferably in a garden or flower bed. Check on the container every 24 hours and observe whether or not the container draws any pests, such ants or mice. Alternatively, fill a Tupperware container with pet food and see if your pet can locate the food by smell.