Balancing and Weighing (BAW)
Children explore the relationship between balance and weight and learn strategies for making comparisons. They explore by manipulating objects on a beam balance, building mobiles, and by using an equal arm balance. The relationship of density, weight, and volume among different foods is explored. This unit was developed by the National Science Resources Center with support from the National Academy of Sciences and the Smithsonian Institution.

The Life Cycle of Butterflies (LCB)
Children observe and record the changes of painted lady butterfly larvae from caterpillar to adult. As they observe the changes, children learn about stages of development and structure of the organisms. Misconceptions they may have held are challenged through observation and discussion. This unit was developed by the National Science Resources Center with support from the National Academy of Sciences and the Smithsonian Institution.

Liquids (LID)
Children investigate substances that are dissolved and returned to their original form. They make solutions, observe evaporation, and discover how some solutions crystallize. They explore properties of liquids which include surface tension, miscibility, and density. This unit combines two Great Explorations in Math and Science publications, Liquid Explorations and Involving Dissolving. They were developed by the Lawrence Hall of Science, University of California, Berkeley.