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 activity works well with a group or just with a parent and child, and it can make a great party game since it's both fun and inexpensive.

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

Your child might have noticed how bubbles quickly lose their colors and pop. Check out this creative way to make those bubbles last longer.

This will encourage your child to utilize their observation skills, develop aesthetic awareness, build artistic drawing abilities and learn about the seasons.

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

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.

In this activity, your child will transform an egg into a glowing, bouncy "ball" that they can play with.

Here's a pressed leaf card project that puts science and writing together for your second grader.

Find out whether soil amendments can improve soil conditions and help you grow a bigger beanstalk in this ecology experiment!

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

Want to make Halloween truly eerie? Science to the rescue! These ghouly hands come alive with a little help from simple chemistry.

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

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

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

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

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

This science fair project idea investigates if webbed feet help a duck (and others) swim.

Is your little scientist up for a rocky challenge? Let them make their own geode rocks using eggs and epsom salts!

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 science fair project idea investigates which objects float and sink in honey, water, and oil.

Your child will do a fun science experiment using soap and pepper flakes to help understand the concepts of water molecules and the surface tension of water.

You don't need to wait for rain to see a rainbow. Make one yourself, and teach your child about light and weather in the process.

Come take off your shoes and explore with your feet. Your child will embark on a barefoot adventure as he plays with different textures.

Introduce your child to the importance of preserving the world's biodiversity by turning a lesson on endangered species into a fun game for the whole family.

In this science fair project, we'll use a liquid crystal thermometer to find out whether exercising makes a difference in people's temperature.

Create a self-portrait from natural materials in this collage craft activity!