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Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

Wool can absorb 1/3 of its weight in water, while still keeping the body warm. She can test this theory by performing a scientific sock comparison!

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This classic children's game demonstrates how sound travels through air vs. through a solid.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

Play this flashlight game with your child to teach him about objects that are transparent, translucent, and opaque.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Chemistry is a blast with this backyard bomb made from a sandwich bag. All you need are ingredients from the pantry to create a satisfying, and safe, explosion.

Put a twist on traditional oil painting with this fun science activity that you and your first grader can do together.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Blanket forts are a kid classic! Let your child create a âfortress of solitudeâ on his own for reading, telling scary stories or for cozy cocooning.

What's cooler than an explosion? Not much! This simple science experiment lets kids build their own pop rocket. So put on your safety goggles and let her rip.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

This easy Halloween-themed science experiment for first-graders is perfect for chilly October afternoons or great as a Halloween party activity.

It's easier than you think to make homemade play dough -- just a few pantry staples makes a natural version of the toy that kids have loved for generations.

Satisfy your sweet tooth with this easy summer activity! Make homemade ice cream and let your child practice his science skills.

What's a liquid? What's a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

Explore solids and liquids with your young scientist by making gluep, a goopy substance that can behave like both a solid and a liquid!

Ready for takeoff! Make science fun and teach about levers and fulcrums as your child sends buttons flying.

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

Explore the scientific concept of capacity by seeing how many pennies you boat can hold before it sinks!

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

Make meringues with your first grader and see how states of matter can transform before your very eyes. Here's how:

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.

Here's a science experiment that gives your kids a chance to see how fire needs oxygen to burn, with a little math and writing practice thrown in.

How do people move pianos and heavy furniture into tall buildings? Show your kids some pulley potential with this simple household exercise!