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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:

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

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.

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

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.

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

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

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

Here's a fun at-home activity that will help your child strengthen math skills using high and low temperature data, and become a master temperature tracker!

Which do you prefer: real or artificial? Try this sweet little taste experiment to help your kids develop a better awareness of the food they consume.

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.

With this science fair idea, little scientists will gain valuable insights into the physics behind throwing a baseball.

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

To help your child learn how to use a thermometer, try this temperature collecting activity at home.

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

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!

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?

These flying potato poppers make a cool sound, create a celebratory mood, and they can teach your child about the power of air pressure.

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

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

Try this chemistry experiment with your curious kid and get some "shocking" results!

Here's a fourth grade science craft with lots of benefits: it's good for birds, good for your child's learning, and good for the planet, too.