This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

Learn all about balance and motion as your child designs a corn maze!

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

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

How does dishwashing liquid work? Kids discover the chemical mechanism behind cleansing power in this easy science fair project idea.

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Teach your child to dye eggs with natural ingredients from the grocery store. From pink to gold, these eggs are perfect for hiding, hunting or simply munching.

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

Create a three-dimensional X-ray of your child's hand in this simple modeling activity. All you need to get started are black paper and drinking straws

Can you imagine a sky filled with bright, colorful bubbles? Make this whimsical scene come alive with bubble science!

This science fair project teaches students about wilting and browning of salad greens.

Help your child make a beautiful homemade sandcastle that will last!

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

Learn about this simple machine and make a pulley of your own to use for fun science trials.

Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Help your child understand the scientific concept of evaporation with this fun outdoor science activity.

Start your toy engines -- this is going to be a fast and friction-filled race!

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

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!

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

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.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.