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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

In this activity, learners of all ages can enjoy experimenting with ice. Try this experiment at the kitchen table or in the great outdoors to encourage budding scientists to experiment with ice.

In this design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

This is an activity that models the operation of a seismograph, a tool used to measure the size of earthquakes.

In this design challenge, learners will create wind-powered contraptions to transport a load, such as a cupcake or another small object, and test to see if they work.

In this activity, learners conduct a simulation exercise related to public key encryption and try to intercept a message sent between two learners.

In this activity, learners smell bottles containing bee pheromone molecules (or herb/spice extracts as a substitute). Bees release these molecules to send messages to each other.

This activity explores the main algorithms that are used as the basis for searching on computers, using different variations on the game of battleships.

Some aquatic organisms live in open water, while some live in soil at the bottom of a body of water.

In this activity, learners explore what happens when polarized white light passes through a sugar solution.

In this design challenge, learners will practice empathy and design thinking skills by creating a play space that is fun, both for themselves and other kids.

In this activity (located on pages 23-24 of the PDF), learners are introduced to structural engineering and encouraged to practice goal-oriented building.

To learn how friction affects motion, learners build a measurement tool from a rubber band and other simple materials.

In this simulation, learners use M&M™ candy to explore radioactive isotope decay.

Learners build a simple hovercraft using air from a balloon to levitate a craft made from a compact disc (CD).

In this genetics activity, learners extract DNA from an onion, using detergent solution, a food processor, and rubbing alcohol. They will also discuss genetic engineering of plants.

In this activity, learners experiment and observe how the color of materials that cover the Earth affects the amounts of sunlight our planet absorbs.

This is a great activity about wave interference. Learners will create their own wave machine and discover wave properties through hands-on investigation.

In this activity, learners are challenged to design and construct a windmill to harness the power of wind.

In this activity, "write" a secret message in genetic code as beads on a string.