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.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

Make all-natural dye from vegetables to create gorgeous homemade play-silks!

This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

Help your kindergarten scientist understand the concept of surface tension with this simple science experiment.

Learn how to grow an avocado plant indoors with your 1st grader in this hands-on gardening activity.

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

Kids conduct a simple science experiment to see if seeds can grow without soil in this simple kindergarten science activity.

In this project, learn about animal vision and different kinds of eyes: ocelli, compound eyes, and camera eyes. Find out what a jellyfish or grasshopper sees!

You don't need to wait for rain to see a rainbow. Make one yourself, and teach your child about light and weather in the process.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

This science fair project idea investigates how the shape of an object affects drag.

Let your second grader pay homage to an ancient Olympic tradition with this modern day Olympic wreath!

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

Uh-oh! Is that a pill sitting on the counter or a piece of candy?

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!

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

Play Rock Tic-Tac-Toe, the perfect outdoor game for all ages. Help your child develop thinking skills and get away from the TV!

Start your toy engines -- this is going to be a fast and friction-filled race!

Has your child ever played weatherman? Try this science activity that lets kids try their hands at observing and predicting the weather.

The possibilities are endless with this fun Halloween-themed STEM activity! With simple supplies, your child will experiment, adapt, and use their creativity while they build structures using different specifications.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Make "fossils" with your child to hide in the sandbox or at the park or the beach, to help your child explore his archaeological side.

Use dirt and different colors of craft sand to make unique layers in a clear plastic cup to represent the layers of the Earth.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.