Materials
Half of a grapefruit and orange, hollowed out
Items to use as units of measure, such as bear counters
Large bowl of water
Instructions
1. Place the fruit halves in the water. Ask the children to predict how many of the counters thefruit "boat" might hold before it sinks and whether the way the counters are placed insidewill matter.
2. Give the counters to the children and let them experiment. Compare their predictions withwhat happens.More to doMore science: Experiment with other types of fruit "boats" and small counting items, such aslarge buttons, play money, walnuts in the shell, etc.