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Our bodies defend themselves in many different ways to prevent us from getting sick.

This activity includes several games about animal sounds. Using their sense of hearing and communicating with various kinds of noisemakers, learners role-play predator and prey.

In this activity, learners explore the concept of density by pouring 5 different liquids into a jar. Food coloring is added if needed to give each liquid a distinct color.

In this experiment, learners examine the way oil affects bird feathers and test different cleanup methods to find out which works best.

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.

Learners make a mobile model of a carbon atom using clay, wire, and pipe cleaners.

In this activity, learners will explore vegetative propagation while preparing food scraps to grow into plants.

In this activity, learners will create their own percussion instrument with recycled materials. Learners will explore design, fabrication, cause and effect and sound through this activity.

In this activity, learners explore how engineering has impacted the development of bridges over time, including innovative designs and the challenge of creating bridges that become landmarks for a cit

In this activity (on pages 20-23 of PDF), learners build a model of a power plant using simple materials.

In this activity, learners use Teflon (PTFE) tape to write secret messages.

In this activity, learners make a 3-D model of magnetic fields by inserting a small, strong magnet into a sphere.

In this activity, learners build a slide whistle using PVC pipe, bamboo skewer, and piece of foam. Construction of the instrument is relatively simple.

In this activity, learners use a fictitious map of "Tourist Town" and counters to problem solve how to place ice-cream vans on street intersections so that every other intersection is connected to one

In this activity, learners build water-propelled engines from soft drink cans.

In this activity, learners participate in several full-body interactive games to model the process of self-assembly in nature and nanotechnology.

In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

In this design challenge, learners will create their own roller coaster using household objects for the track and a marble or small ball as their cart.

In this activity, one person acts as a human robot while another acts as their developer by programming their actions.

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.