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In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

This Labor Day, encourage your child to learn more about the different tools and supplies found in a doctor's bag by having her create one of her own!

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.

Take a look at this oogly-googly eye Halloween craft! Have your child tweak the design to learn about balance and counterbalance with this crazy-eyed creature.

Re-purpose a tin can into a pretty compost bucket for your family's kitchen counter and learn about the science and fun of recycling and renewing objects.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

Make a paper jack-o'-lantern treat bucket this Halloween! While crafting, your kid will learn about the process of creating self-standing sculptural objects.

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?

Learn how to make a haunted house with this Halloween craft. See how to make a haunted house with a project that is fun for ghosts and ghouls alike.

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

Learn how to make a trick-or-treat bag for Halloween. See how to make a decorative trick-or-treat bag with this Halloween craft tutorial.

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.

In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

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.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

Write a letter to Santa and bring back the lost art of letter writing. Learn how to write a carefully crafted wishlist using proper letter form.

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

Here is a fun middle school science project on factors affecting solubility. Learn how dissolved solids can "crash out" to form crystals when conditions change.

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.

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.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

Children will learn why and how to compost as they help with the process of filling their compost, turning it, and observing the changes that occur.

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Have a Twelfth Night celebration with this holiday tutorial and craft. Learn how to throw a Twelfth Night celebration in your house this winter.

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!

Encourage your third-grader to create a reverse glass painting. This will help him learn art concepts and improve his critical thinking skills.

Help your child learn about the world through this 3rd-4th grade geography activity: start a postcard collection and mark where they came from on a world map.