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.

Would your dog prefer homemade or store-bought food? Raw or cooked? Test your dog's preferred diet in this fun experiment.

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.

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

How well can people recall what they have observed. Test your knowledge in this fun experiment.

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

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.

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

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?

On the next chilly, winter day, invite your fifth grader to make a hand warmer by experimenting with the loaded combination of a few natural ingredients.

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

Demonstrate how static electricity can cause an object to move. It also examines just how an object affected by static electricity will move.

Discover that the absorbency of fabrics depend largely on the shape and structure of the individual fibers that make up the fabric.

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

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.

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.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

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