Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

This science project teaches students to classify different shapes of leaves.

Amaze your kids by separating a salt and pepper mixture using an "electric spoon" charged with wool.

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

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

What is it about a Slinky that causes it to walk down the steps? This simple experiment is a perfect illustration of both gravity and momentum.

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

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!

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

examine how passive solar heating works, measure temperature in a parked car on a sunny day. ways to use passive solar heating as an alternative, energy

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

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

Spiders don't go to grocery stores or fast food chains to get their food -- they set up traps and wait for their food to come to them!

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

How can we describe the relationship of magnetic field strength vs. distance? Kids will find out with this free science fair project idea.

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!

How well can people recall what they have observed. Test your knowledge in this fun experiment.

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

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

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

Have you ever wondered how many numbers most people can memorize? Test your friends to find out!

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.

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

Help your child get a grasp on what it was like to build gigantic ancient structures with this easy engineering activity about science and physics.