In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

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

In this project children practice the scientific method while playing with puffy paint.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

How do organic materials become soil? This science experiment measures what materials biodegrade.

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?

In this activity, your child will be challenged to make a tower using paper cups.

Plants and light seem to be good buddies, but how far does the friendship really go?

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

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

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

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

This recipe makes bubbles that not only blow up nice and big, but do tricks and experiments! How do you do it? It's not a secret, it's science!

In this activity your child will create their very own marble maze!

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

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

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.

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

This science fair project examines how seeds hitchhike on animals and clothing.

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!