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In this activity, learners use sieves with different-sized holes to sort balls by size.

"Exploring the Solar System: Craters" is an active, hands-on activity that demonstrates how craters form, and what they can teach us about the history and composition of planets and moons.

This is written as a display, but can easily be adapted to a hands-on activity. Learners observe and shake containers of shiny liquids.

Learners cover a bottle with a balloon. When they immerse the bottle in warm water, the balloon inflates. When they immerse the bottle in a bowl of ice, the balloon deflates.

Some bugs can walk on the surface of a lake, stream, river, pond or ocean.

In this activity, learners will make cleaning up more fun with predictions and counting. Estimate how many things are on the floor (or table), then count as they are picked up.

In this interactive game, learners will test their memory of animal and insect sounds. Flip over cards, listen to the sound, and try to find the ones that match.

In this biology activity, learners recreate the process of digestion in a zip lock bag. A bit of soda pop added to some crumbled crackers approximates how acids in the stomach dissolve food.

Use multiplication to help the aliens find out how much fuel they need to get their spacecrafts home.

In this activity, learners examine nanoscale structures of common things.

In this demonstration, learners attempt to get a large coin through a small hole, the size of a smaller coin.

In this activity, learners turn an ordinary metal coat-hanger into a (very quiet) musical instrument.

Learners explore their surroundings while reasoning about categories and counting.

In this chemistry activity, learners prepare two petri dishes, one filled with water and one filled with milk.

In this activity, learners investigate the properties of graphene and graphite.

In this activity, learners explore why humans sweat. Learners compare the effects of heat on a balloon filled with air and a balloon filled water.

In this activity, learners explore in what ways the shape of the land and the pull of gravity influence how water moves over Earth.

Learners will explore the concept of angular distance, and investigate why the moon appears to be the same size as the sun during a solar eclipse, despite the sun being much larger.

In this activity, learners build a LEGO® structure while wearing mittens. This activity shows learners how difficult it is to build small things when your tools are too big.

This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'