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Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

Your kid will be captivated as she watches liquids change color before her very eyes during this fun science project that introduces some chemistry basics.

What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

Blend science and math to explore a very important first grade social studies question: does our planet contain more land or more water?

This science fair project idea investigates if fats add to the flavor of food.

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.

Combine your child's natural curiosity with his developing classification and writing skills by helping him create a backyard field guide.

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

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

Start your toy engines -- this is going to be a fast and friction-filled race!

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

This experiment works due to a simple principle: plants need light. Build a shoebox maze and watch the plant work though the obstacle course, searching for sun.

Has your child ever played weatherman? Try this science activity that lets kids try their hands at observing and predicting the weather.

Instead of the traditional egg hunt, try this creative variation that will result in a beautiful Easter garden.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

How powerful is the reaction between baking soda and vinegar? Find out here!

This science fair project idea explores substances that cause a bubble to last longer.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

Making your own glass cleaner is easy, effective and inexpensive!

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

You don't need to head to the Arctic to experiment with life in an igloo. Learners can build their own ice igloo at home from water and empty milk containers.

Here's a first grade ladybug game that explores how air can move solid objects, and adds some measurement practice, too. Play, learn, and enjoy!