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.

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

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.

How powerful is the reaction between baking soda and vinegar? Find out here!

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

Put your second grade scientist to work this Fourth of July with our colorful "liquid fireworks" project!

This trick uses vertical and horizontal forces to help your child to push apart your hands apart, no matter how hard you try to keep them together!

Stir up some enthusiasm for experimentation with this candy-cracking science experiment!

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

This science exploration lets your first grader see how eggs can provide a perfect environment for a living, growing creature.

Here's a fun activity to help build thinking skills in young first grade scientists, and to encourage them to have a blast exploring the mass and volume.

How do we know that air exists when we can't see it, taste it, or touch it? Here's a classic experiment that will teach your kid some basics of aerodynamics!

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

Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!

Teach your first grade scientist the difference between liquids and solids using maple syrup.

This fun marbled paper craft uses things you're likely to have around your house, and it teaches kids some simple chemistry too!

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!

Introduce your child to the world of motion and physics with a bit of marble play inspired by Sir Isaac Newton!

First grade science often covers solids, liquids, and gases. This silly science explores serious facts about the difference between all three.

Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

In this 3rd grade science activity, you'll experiment with the little-known fourth state of matter: polymers! Mix borax with white glue and watch what happens.

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

Help your first grader explore the world of scientific measurement by "weighing" fruit with a "water scale"!

Help your curious third grader construct a dazzling spinning wheel that will teach him about the science behind colors while providing some silly entertainment!

When you see those sunscreen "protection levels," what does that really mean? Try this experiment to find out.

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

Take this "paper plate snack test" with your child for a hands-on lesson in making healthier choices to teach your child about what's in his food.

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

Think you can blow up a balloon without using your mouth? This isn't just a cool trick, it's also a great way to introduce chemistry and biology concepts.