What causes dilated pupils? Young scientists will find out by applying what they already know about changes in pupil size and making models of the pupil.

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

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

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

Is it magic? No...it's the amazing, gravity-defying capillary action experiment! Kids will love this dramatic and enlightening science fair project.

In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.

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

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

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

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

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

Enter the buzz worthy world of bee watching and find out what time bees like to wake up!

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

Will storing cucumbers and tomatoes in the fridge destroy their unique flavors? Find out in this science fair project idea!

Do you think you can blow down a sand castle with a mighty wind? Find out which material stands up best to erosion in this erosion experiment.

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.

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

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.

This science fair project idea explores how length affects the weight a bridge can hold.

How does smell affect taste? Ready your taste buds--in this project, you'll gather some test subjects and do a taste test to see how much smell affects taste.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

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

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

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