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In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

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

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

Make meringues with your first grader and see how states of matter can transform before your very eyes. Here's how:

It's easier than you think to make homemade play dough -- just a few pantry staples makes a natural version of the toy that kids have loved for generations.

This project can help prepare your child for a trip to the tide pools, or give him a way to remember some of the many creatures he saw during his visit.

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

Help your child get to know the least-appreciated of the five senses, the sense of smell, with a smelling station.

Teach your child how butter is created by shaking up cream the old-fashioned way.

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

Water can go from solid to liquid to gas...but how does popcorn go from kernel to snack? Invite your first grade scientist to find out.

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

When you see those sunscreen "protection levels," what does that really mean? Try this experiment to find out.

The fish most kids see is usually filleted, and it's hard to see how it came from a lake or sea. This cool gyotaku activity blends life science with art!

This science exploration lets your first grader see how eggs can provide a perfect environment for a living, growing creature.

Kids will explore the corrosiveness of soda in this cool science fair project by leaving pennies submerged in soda overnight.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

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

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

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

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!

Learn how starch and carbohydrates interact with different solvents in this fun and easy packing peanut science fair project.

In this fun activity, your child will create their very own solar oven to bake s'mores!