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Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

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!

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

Your fourth grader will hone his fine motor skills and learn to follow directions as he creates this recycled angel tree topper out of an ordinary soda bottle!

Use the holiday gift giving season as an excuse to give your fourth grader a valuable lesson in making and keeping a budget!

Put your young paleontologist's puzzle-solving skills to the test by having her hunt for dinosaur bones and then assemble them to create dinosaur skeletons.

As your fifth grader brainstorms and creates a plan for peace, your child will give his creativity and fine motor skills a boost!

Help your third grader author a lovely limerick in honor of Valentine's Day! He'll be delighted to compose and recite this nonsensical poem.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

This chore obstacle course will keep your child entertained and engaged, while also helping them improve their efficiency at everyday tasks.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

Be active while learning about American history with this twist on the classic running game "Capture the Flag."

In this arts and crafts activity, help your kindergartener make friendship bracelets with just safety pins, elastic, and some colorful beads.

In this activity, your kid will watch coal turn into crystals right before her very eyes, and learn some science along the way!

This science project teaches students to classify different shapes of leaves.

This science fair project idea studies which kind of rock (sedimentary, igneous, or metamorphic) is most damaged by frozen water.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

Hone your child's skills of observation and take a look at forensic science for an interesting afternoon of exploration and detective work!

Find out whether optical mice are useful on all surfaces or if there are drawbacks to this supposedly superior solution to the traditional roller-ball mouse.

Find out whether putting something on top of a plant will inhibit its growth.

This twist on the classic game of freeze tag spells fun for your fourth grader--and the whole family!

The human knot game is a perfect team-building exercise and a fun activity that's sure to bring lots of laughs along the way.

Take play-dough to the next level with this homemade recipe, adding surprising ingredients perfect for summer!