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In this activity, learners explore atoms as the smallest building blocks of matter. With adult help, learners start by dividing play dough in half, over and over again.

In this activity, learners use gumdrops and toothpicks to model the composition and molecular structure of three greenhouse gases: carbon dioxide (CO2), water vapor (H2O) and methane (CH4).

No glue is needed for learners of any age to become marshmallow architects or engineers.

In this activity, learners build models of comets, using edible materials, to learn about comets' structure.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

This is a classic exercise for visualizing the scale of the Solar System.

In this dynamic activity, learners build a catapult that launches projectiles, such as marshmallows.