Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Create safe lightning for kids! They'll learn how to make lightning at home with this fun science fair project idea illustrating static charges and grounding.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

In this science fair project, students make their own rain gauge to measure rainfall.

Use pepper and soap to discover some fun facts about the properties of water.

This science fair project idea determines what household items are good conductors of electricity.

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.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

This easy and inexpensive paper towel science project introduces kids to important physical concepts like cohesion, adhesion, and capillarity.

In this fun experiment, we'll find out how color affects heat absorption!

Check out this cool science fair project on identifying rocks and minerals for kids.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

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

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Find out which type of sponge holds the most water.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

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.

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

Science fair project which determines whether plants are able to get enough nutrients from different types of garbage.

In this CD hovercraft science project, students will construct their own DIY hovercraft.

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?

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.