In this project, waves of vibrations are experimented with using water in glasses.

This project compares the strength of one, two, and three-ply toilet paper.

Find out whether a longer airplane will fly farther or a wider paper airplane.

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

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

Show your kids the power of baking powder by conducting a simple experiment. Make four batches of cornbread, all identical except for one thing: baking powder!

Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

In this 3rd grade science activity, you'll experiment with the little-known fourth state of matter: polymers! Mix borax with white glue and watch what happens.

Looking for an enjoyable evening activity you can do with your kids? Study the stars: help them learn about constellations by making one of their own.

Make a DIY golf putter and design your own golf putting course in this 2nd-3rd grade arts and crafts/game activity.

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!

Crystals are a very special structure. In this third grade activity, your child will learn how to grow salt crystals.

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

This first grade science activity brings the green grass of early spring inside while teaching your child about the cycles of growth.

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

In this project students experiment with making music using only glasses of water.

In this outdoor science activity you'll find tips on how to create a nature journal by choosing a native plant or animal and tracking that species.

Observe with your third grader what happens when food starts to decompose, and boost science skills simultaneously with this experiment!

In this project children practice the scientific method while playing with puffy paint.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

Grow a garden with an environmentally-friendly twist by using plant scraps that usually get thrown away.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Do you think heat can affect a plant's growth rate?

Learn about different fern fronds with your third grader as you create lacy, natural decorations on your Easter eggs this year.

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.