Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

This science fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

Make a DIY golf putter and design your own golf putting course in this 2nd-3rd grade arts and crafts/game activity.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

This science fair project focuses on a polymer called hydrogel super absorbent crystal which absorbs water, swelling to many times its original size.

Grow potatoes in a plastic bag—easy to grow and harvest, and yummy to eat!

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

Create a homemade pair of sunglasses with colored lenses to see just how light and color affect our sight! Use this fun project to practice science!

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.

Science fair project that teaches you about chemical indicators and how to make your own in order to identify various mystery solutions.

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

Can you plant the insect-attracting borage plant to increase the amount of beneficial insects in your garden? Find out in this experiment!

Learn about nature by making your own mini moss garden.

This year on Mother's Day, try this gift project that brings together an appreciation for gardening with a hands-on lesson in art history.

Test your friends to find out if you can replicate the placebo effect's incredible results.

Popsicles aren't just for the summertime, this activity takes cold and turns it into a creative and tasty science experiment.

Here's a fun science experiment that's refreshingly tasty too! Turn regular water into a tasty treat perfect for consuming on a hot day.

Show your child how and why the microwave works, while demonstrating just how strangely foods can behave while inside the crazy cooker.

What better way to celebrate spring than with a fabulous flower party? Pack the day with fun flower activities and treats for a truly springalicious event!

Help your child create a magical miniature garden in the most unlikely of places: a recycled plastic bottle!

This study evaluates if electronic devices commonly found in most households emit radiation, and if they do, how much?

Got a birdwatcher on your hands? Bring the birds to your backyard by making a zany bird feeder using an orange and some string.

Chemistry isn't just incredible ... sometimes its edible! These crystal lollipops are a delicious introduction to chemistry concepts.

The purpose of this science fair project is to demonstrate how yeast, a fungus, causes bread to rise.

In this project, vinegar and salt act as preservatives keeping bacteria from growing in the bouillon mixtures.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.