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This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

In this design challenge, learners will engineer a structure and see if it can survive an earthquake they create.

The Ancient Egyptians used a naturally-occurring salt from the banks of the Nile River, called natron, to mummify their dead.

In this twist on a classic design challenge, learners will try to stop a bouncy ball from bouncing as they explore how to control the fall of an object.

Put on a pair of gloves and be the conductor of your invisible orchestra!

In ancient Chaco Canyon, the people used a "sun dagger" petroglyph to mark the passing of seasons.

In this chemistry demonstration, learners will discover that phenolphthalein is an acid/base indicator. One learner will read a poem about four witches making a potion.

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 construct wands that play different notes depending on information from light sensors programmed via a PICO Cricket.

This is an online game about the complexities of farming. Learners will "draw" cards and make decisions about how to take care of their farm.

In "Chemistry is Colorful" learners explore different materials through paper chromatography.

This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen.

In this activity, learners build a hot air balloon using just a few sheets of tissue paper and a hair dryer.

In this creative roleplay activity, learners will explore the various processes of the carbon cycle using movement and props to aid in comprehension.

As a long-term project, you can rear monarch butterflies at home or in a classroom.

In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

This fun and simple hands-on astronomy activity lets learners make 3-dimensional models of the Earth and Moon.

In this physics activity, learners build a toy with a figure that spins around like a gymnast on the high bar.

In this activity on page 8 of the PDF, learners make a slimy substance very similar to mucus, and sprinkle it with glitter to imitate the way that allergens are trapped.

In this activity, learners act as epidemiologists by mapping the prevalence of HIV/AIDS worldwide.