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

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

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

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

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

Water can go from solid to liquid to gas...but how does popcorn go from kernel to snack? Invite your first grade scientist to find out.

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.

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

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

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

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

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

Your 1st grade scientist will improve her observation skills as she's encouraged to eat healthy by comparing the dry and fresh fruit in this experiment.

Engineers in training can get started with this simple wheel-and-axle construction activity.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

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.

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

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

Bring the magic and mystery of the night sky to the light of day with this fun constellation art project!

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.

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

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!

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.

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.

Did you ever think you could make colors disappear right before your eyes? This science experiment is just like a magic trick: now you see it, now you don't!

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

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

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

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.