This science fair project idea explores how length affects the weight a bridge can hold.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

This science fair project focuses on the use of the enzyme amylase found in human saliva to break down starch into sugar.

Do different types of oil mix or stack? Find out in this science fair project idea!

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

Here's a fourth grade science craft with lots of benefits: it's good for birds, good for your child's learning, and good for the planet, too.

Kids will love making sugar crystals in this sugar crystal science fair project which teaches important chemistry concepts like saturation and solubility.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

Would it hurt to skip brushing your teeth just this once? Let's find out by seeing which foods produce the most mouth bacteria.

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

In this science fair project, students create their own miniature salt flats at home.

Determine whether butterflies like to drink sugar water, salt water, or plain water.

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

Examine the effect of pressure on carbonation in soda.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?

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

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

Set off an a science adventure as you prepare a row of bee homes for your new visitors.

Take advantage of the spring and summer sun in this arts and crafts activity that has your learner creating pretty flower prints.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

This science fair project idea explores whether there is a connection to the color a person wears and the way their emotional state is perceived by others.

Cleaning can be a chore, but not with this sudsy experiment!

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.