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What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

What are the benefits of good posture? Kids will learn about the cognitive effects of good posture through conducting and observing a controlled experiment.

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

This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

Science fair project which teaches you about the principles of physics within a vacuum by creating a vacuum chamber.

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

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Observe how your brain works while it is focused on one thing, and how it works while you are distracted by another thing.

Take a dive into the candy jar with this yummy science experiment.

Examine the effect of pressure on carbonation in soda.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

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

The purpose of this study is to determine if people can tell the difference between organic and conventional food from looking at, smelling and tasting it.

This project examines what types of objects burn and which burn faster and cleaner.

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

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

Kids learn about examples of mechanical weathering and conduct an experiment with seeds and plaster in this cool geology science fair project idea.

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

In this Bernoulli's Principle experiment, you'll learn how an increase in the speed of a fluid, like air, decreases pressure.

The objective of this science fair project is to study the photosynthesis process and demonstrate the important role that leaves play in the process.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

This activity challenges students to use computational thinking as they create a sequence of commands that will make a robot navigate around several obstacles.

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.

Science fair project that determines whether mass and weight are the same or different.

This science fair project idea investigates the hardness property of minerals.

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