In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

Want to spark your third grader's interest in gardening? Help him make popsicle stick fairies to decorate an enchanting garden oasis.

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!

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.

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

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?

Is it a square or a circle? See if you can trick your friends with this zany science project!

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

Want to make Halloween truly eerie? Science to the rescue! These ghouly hands come alive with a little help from simple chemistry.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

Grow a garden with an environmentally-friendly twist by using plant scraps that usually get thrown away.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

Science fair project that examines condensation and the conditions needed in order for dew to form.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

This weather spinner will improve observation skills by encouraging children to examine and track weather details and patterns.

In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

In this science fair project, students use the streak test to tell minerals apart from each other.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.