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!

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!

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

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.

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.

Try this fun math card game with your third grader to practice division, addition, and problem solving!

In this high energy, interactive game, third graders are challenged to race, involving spelling patterns in words.

If your third grader is having difficulty sequencing events in a story, try creating this book square.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

Teach your third grader about the concepts money and purchasing with this "Mock Card Shop" activity.