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Is the birthday paradox really a paradox, or just an intriguing problem that defies intuition? Find out with this birthday paradox science fair project.

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

Young physicists will wrestle with a discrepant event: the Hammer Ruler Trick. They'll make some inferences about torque, balance, and center of gravity.

Do dogs understand English? Kids will find out with one of our favorite dog science fair projects that tests how dogs process human language and other cues.

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

Water, along with soil and light, is a necessary component for plant growth. So what's better for promoting plant growth: tap water, or rain water?

Can you fool your eyes and your brain with an optical illusion? The purpose of this science fair project is to demonstrate various kinds of optical illusions.

The objective of this science fair project is to determine whether drawing with the right side or the left side of your brain will produce a better picture.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

Kids get step-by-step instructions for how to make a rubber band car and explore the physics of potential energy with this fun engineering science fair project.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

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.

Are your taste buds up for the challenge? Put tongues to the test with this science fair project that examines who enjoys sour flavors more, adults or kids?

Score a bull's eye with this cool science fair project on horizontal projectile motion. Guide a marble to its target and predict its trajectory using math!

.Have you ever had problems with your wifi signal strength? In this experiment you will learn about how wireless signals pass through the air and solid objects.

This science project examines the thermal properties of several major greenhouse gases.

In this experiment, you will find out how human error can cause faults in any science task. This includes experiments conducted by famous scientists also.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This free science fair project explores the "dirty" relationship between the presence of organic material in soil and water absorbency.

This project explores the effectiveness of various common household ingredients in cleaning tarnished and oxidized coins.

This science fair project idea demonstrates how our fingers prune when in water.

This science fair project idea explores whether the color of surroundings affects human mood.

This science fair project compares the abilities of men and women to understand subtle communication through body language.

Science fair project which uses a camera to observe the surface of a balloon in the moment of its explosion.

Explore the electrical energy present in energy drinks.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

This experiment will explore the best way to create a perfect soft-boiled egg.

Design a survival kit. Brainstorm various survival scenarios. Address basic human requirements and natural resources. Describe each tool as well uses.