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Known as the waterfall effect, this activity demonstrates adaptation in our visual system.

In this activity, learners complete simple exercises to investigate the relationship between force, area and pressure and their effects on materials.

In this activity, learners will write a secret message that only their friends will be able to read.

“Exploring the Universe: Imagining Life” is a hands-on activity in which visitors imagine and draw an extreme environment beyond Earth, then invent a living thing that could thrive in it.

If you have 3-foot dowels and rubber bands, you can can started on this fun and open design challenge. You can make structures big and small: make it so you can fit your parent into it!

In this activity, learners explore how the pendulum has been a reliable way to keep time for centuries.

In this full inquiry activity (located on page 3 of the PDF under GPS: Kinetic Sculpture Challenge Activity), groups of learners will make predictions about which feature of a pendulum (mass, length,

In this activity, learners explore the unique challenges in transportation engineering, such as devising a method for skiers or hikers to get to the top of a mountain.

In this activity, learners make an electroscope out of a foam cup, straw, aluminum pie pan, thread, and foil. Learners use their electroscopes to test for static electricity.

In this optics activity, learners build an animation tool to make mini movies. When you spin a phenakistascope, the pictures move so quickly that your eyes and brain can't separate the images.

This demonstration/activity helps learners understand why higher elevations are not always warm simply because "hot air rises." Learners use a tire pump to increase the pressure and temperature inside

In this design challenge activity, learners build a four-stringed instrument that can play a tune.

In this activity, learners build rockets and shoot them into the air by stomping on the plastic bottle launchers.

Learners will build a homemade pump using a balloon, a mason jar, and some straws.

In this activity, learners compare plant and animal life in different habitats including a sidewalk crack and lawn. Learners sort human-made materials and natural materials found in each habitat.

In this activity, learners build a switch to turn electrical circuits on and off.

In this activity, learners will engineer a roof using simple materials to protect a construction paper person from a rainstorm.

These puzzles use four colors of socks in a drawer to get learners thinking algebraically.

This activity shows how our experience of the Sun changes with time and location. The sun dagger at Chaco Canyon is thought by many to be a sort of ancient timekeeping device.

In this activity, learners construct a traditional handicraft toy that illustrates a motion commonly associated with violins and earthquakes.