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

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

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

Science fair project in which you will attempt to throw a ball the greatest horizontal distance possible by using different angles.

Certain fruits can change gelatinâs ability to set. In this experiment, kids will discover what happens when gelatin meets pineapple enzyme.

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

This experiment examines whether storing your orange juice at different temperatures affects its acidity.

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.

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

This science fair project idea examines whether boys and girls differ in reflexes.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

This science experiment tests if dog saliva can really help heal wounds.

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

Students explore hot desert plant adaptations in this cool science fair project by observing how these organisms prevent excessive transpiration.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

Teach kids about a fun way they can remember this more efficiently- the power of mnemonics. Kids will be amazed.

Soil is made up of different layers. How far down do you need to dig to find the soil horizon, or the place where bits of leaves and branches become soil?

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

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.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

The objective of this science fair project idea is to examine light refraction as it passes through liquid crystals.

This science fair project idea explores how far the âdanger zoneâ is from different types of caution signs.

This science fair project idea determines the probability of a coin landing heads or tails.