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This science fair project idea investigates the difference in reaction times between boys and girls.

In this free science fair project idea, kids will conduct an easy electrolysis of water experiment to test solutions of salt, baking soda, tap water, and more.

Determine how different measurements of the same object might yield different values. Provide as many reasons that you can think of.

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.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

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

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

Try this simple activity with your middle schooler to help him develop an understanding of why scientific classification systems exist and how they work.

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

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

Introduce your child to science with something they see everyday--their shadow!

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

If your child aspires to be the next Frank Lloyd Wright, we've got some tips on building sand castles that last.

This easy at-home experiment is a great way to "see" science.

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

In this science fair project, students will learn how to calculate the formula for the thermal decomposition of potassium chlorate.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

In this experiment you simulate radioactive decay in order to gain an understanding of the basics of half-life.

Teach your creative second grader about proportions, animals, and proper cutting methods with cucumber carving.

Science fair project that tests the effects of diluted soap on the size of bubbles blown from the solution. Will dilution cause smaller bubbles?

Science fair project which examines the relationship between frequency of spider web vibration and spider's response time.

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!

This science fair project explores different types of endangered frogs, and why some are endangered while others are not.

Explore the wave-particle duality of light! Learn how light can behave as both a wave and a particle in this cool physics science fair project idea for kids.

Investigate which substances are most effective at removing salt from water.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.