Students develop an understanding of how aspirin works and how understanding its interaction with other chemicals in the body aided doctors in medical research.

Students devise a scientific investigation to detect acids and bases in common materials. Students will prepare a test solution whose color changes when an acid or base is added.

Students learn about air masses and the role they play in weather and climate.

This is an interactive resource in which the students learn about the systems of the body including the respiratory system.

Students learn about animal features and behaviors that can help or hinder their survival in a particular habitat.

This interactive resource uses a series of animated slides to guide students through the development of a hurricane.

Students use the books of April Pulley Sayre to explore how living organisms depend on one another and on the environment for survival.

Students assess the goals, benefits, success, and limitations of technology (instruments) on a space mission.

Students learn about sampling bias by working in three separate groups to survey students, parents, and teachers about the amount of homework students ought to have. They report and compare the responses from each of the three groups to see how the results differ. Activity sheets, discussion questions, ideas for assessment and extensions, and Internet links are included.

Students explore the relationship between a bird's beak and its ability to find food and survive in a given environment.

Students research specific examples of birds (predators) and what they eat to survive (prey) to help them better understand the predator/prey relationship.

Students build a model of the respiratory system and investigate the inputs, outputs, and interactions of the parts in the system.

This lesson is the first of a two-part series on brine shrimp and how the growth and survival of organisms depend on the physical conditions of their environment. Students will design a test to determine the optimum salinity for hatching brine shrimp.

This lesson is the second of a two-part series on brine shrimp and how the growth and survival of organisms depend on the physical conditions of their environment. Students will raise brine shrimp, designing an artificial environment in which they can survive.

Students use the example of the Burrowing Owl to illustrate how human activities can control the fate of a species. In addition to exploring the negative impact community development has had on the owl's habitat, students will read about proactive steps people have taken to reverse this destruction.

Students describe environmental and herditary factors that increase the chance of developing cancer.

Students review and compare plant and animal cells, and then build a model of an animal cell.

Students review cell structures and investigate how the components of a cell operate as a system. Throughout the lesson, students will compare a factory to a cell, beginning to understand how both can be thought of as a system.

Students complete hands-on activities and read information online in order to answer the central question of the lesson: How does understanding the chemistry of hair care, including the role of pH, help in the development of better hair-care products.