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

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

Try this concrete, hands-on organization system and you can count on more efficient, less stressful evenings this school year.

Need to cool down on a hot summer night? This gazpacho recipe does the trick.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

This project makes learning the difference between warm and cool colors easy and fun. And it's a great intro to complimentary colors - great for pop art!

Invite your second grader to help you measure and mix these fresh, cool concoctions!

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

This science fair project idea researches how your choice of clothing affect how hot or cool you feel during the day.

How does salinity affect the point at which water freezes? Kids will find out by performing this cool melting ice experiment.

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

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

Construct a card castle fit for a king! Treat your royal "face" cards (the kings, queens, and jacks) to the cool castle they deserve.

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

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

Looking for hot weather fun? Cool the kids down with a homemade slip and slide! You can create your own water park atmosphere for just a few bucks.

Show your third grader how to string together a pretty, decorative harp.

Practice math and measurement with your third grader this Fourth of July by making these festive cupcakes!

Practice multiplication facts by playing baseball in this fun, third grade math board game.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

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

Practice conversions within the metric system in this fun math card game for third graders.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

This fun math card game is a great opportunity to discuss probability with your third grader.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

This game turns prediction, a major component of third grade reading, into a fun game.

Play this fun basketball game to help your third grader master their multiplication tables.

Help your third grader learn time zones with this fun map activity!

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Kids learn how to manipulate additive and subtractive colors to send secret messages with red colored filters in this cool science fair project idea.