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

This science fair project idea creates cool new colorful fabric pattern designs and experiments with the mixing of colors.

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

Delight your budding scientist with this cool physics magic trick and teach her some basic physics concepts while you're at it!

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

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.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

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.

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.

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

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 experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

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

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.

Help your child make a beautiful homemade sandcastle that will last!

This science fair project idea teaches to understand and explore the concepts of crystal formation and dissolving substances.

Roasting pumpkin seeds makes for a great Halloween activity, and a healthy snack!

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

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?

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

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

It's easier than you think to make homemade play dough -- just a few pantry staples makes a natural version of the toy that kids have loved for generations.

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

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

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Teach your child to dye eggs with natural ingredients from the grocery store. From pink to gold, these eggs are perfect for hiding, hunting or simply munching.

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

Plants and light seem to be good buddies, but how far does the friendship really go?