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

This science fair project explores how osmotic pressure forces water through the root up into the plant.

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.

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

I scream, you scream, we all scream for homemade spearmint ice cream!

In this project, learn about animal vision and different kinds of eyes: ocelli, compound eyes, and camera eyes. Find out what a jellyfish or grasshopper sees!

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

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.

What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

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.

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.

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

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

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.

This science fair project idea investigates if fats add to the flavor of food.

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

This clay "painting" activity encourages and supports creative development and critical thinking skills.

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

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

Young scientists will investigate people's preferences for saltiness, and make some inferences about genetics and diet.

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

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

Do hand soaps and sanitizers prevent the growth of bread mold? If so, why? Kids will find out with this fun and informative science fair project idea.

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

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.