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

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

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.

This science fair project idea investigates which objects float and sink in honey, water, and oil.

Your kid can learn about the process of making frozen yogurt and enjoy a homemade, flavorful dessert. Experiment with this fun, chilly food!

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Students will investigate the thermal conductivity of metals by learning how to measure thermal conductivity with this fun and easy science fair project idea.

What's the quickest way to separate salt and pepper? Let static electricity do the work! Your child will be fascinated by this simple experiment.

Let your young scientist explore a brave new world of sound with an experiment that just requires a handful of common household items.

This science fair project idea measures out the sugar of various foods and find out whether people can correctly determine how much sugar is in common foods.

I scream, you scream, we all scream for homemade spearmint ice cream!

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?

Enjoy those warm spring and summer nights with your child while teaching some basic astronomy at the same time.

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

In this science fair project, students use the streak test to tell minerals apart from each other.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

Kids will make a beautiful rainbow in a jar and learn what enables different types of liquids to remain distinct in separate layers.

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

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

Help your child learn about animal classification with this fun and delicious activity.

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

Slip some science into storm watching with a homemade rain gauge!

Here's a great activity that uses corks and toothpicks to create a fleet of floating boats. Which design makes for the most seaworthy vessel?