Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

This fun marbled paper craft uses things you're likely to have around your house, and it teaches kids some simple chemistry too!

Take this "paper plate snack test" with your child for a hands-on lesson in making healthier choices to teach your child about what's in his food.

Introduce your second grader to the crazy world of static electricity with just a balloon and a sheet of paper.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

Your child will do a fun science experiment using soap and pepper flakes to help understand the concepts of water molecules and the surface tension of water.

This science fair project idea produces varying pitches of sound.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Has your kid noticed how much bigger the moon looks when it's low in the sky? Here's an activity you can do to show them that it's just an optical illusion.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

This 4th of July, explore fourth grade science and make some safe fireworks in your own backyard using soda pop!

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

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.

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.

Engineers in training can get started with this simple wheel-and-axle construction activity.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

Hone your child's skills of observation and take a look at forensic science for an interesting afternoon of exploration and detective work!

Your child might have noticed how bubbles quickly lose their colors and pop. Check out this creative way to make those bubbles last longer.

Combine the science of physics with the fun of playing spy. Your young detective can make his own tiny looking glass. It's simple to make!

This classic children's game demonstrates how sound travels through air vs. through a solid.

Believe it or not, images that are cast upon your eye's light-sensitive screen (called the retina) are upside down. Here's a fun, fast experiment to prove it!

Wondering how we know that air is there? Here's a quick and easy experiment that proves that air may be thin, but it's not too wimpy to block your shot!

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.

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

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

Here's a fun math and science activity: help your child explore four different kinds of measurement, using their hand and a few simple household tools.

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.