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

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

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.

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.

This classic children's game demonstrates how sound travels 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.

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.

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

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.

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.

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.

In this Halloween-themed activity, young learners will find out what happens when they mix two household items together to create a surprising chemical reaction.

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!

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

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

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!

Your kid can learn about the process of making frozen yogurt and enjoy a homemade, flavorful dessert. Experiment with this fun, chilly food!

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

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

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

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

This activity is a fun way to "go fishing" with your preschooler, while learning about the concepts of freezing and melting.

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

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

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.