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Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

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

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

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.

Explore the scientific concept of capacity by seeing how many pennies you boat can hold before it sinks!

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!

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

For your budding first grade scientist, all you need is some simple, natural materials to create an amazing ant farm. Here's how to get started.

Did you know a mouse eats almost fifty times as much as a cow? Find out how and test out the strange science with your friends!

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

In this insulation experiment, you'll learn which clothes keep you warm in the cold, and which make you shiver.

With this cool floating rocks project, your child will get some hands-on experience with buoyancy and learn why certain rocks like pumice are able to float.

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

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

Wiggly worms are known for staying buried in the soil, but how does that affect plants? Are earthworms and plant growth related?

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

Slime: It's oozy, it's goopy, and it's just plain fun! Learn how to make slime with this fun science fair project.

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.

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?