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In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

Find out whether a longer airplane will fly farther or a wider paper airplane.

Kids will learn how to measure the viscosity of liquids by making their own homemade viscometer in this great science fair project idea.

Here's an interesting activity that will enable your child to make his own magnifier out of a drop of water

Science fair project that determines whether landscaping fabric impacts the ability of plants to receive water.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

The garden is the perfect place to practice math and science with preschoolers. Get digging (and counting, sorting, observing at the same time!)

Play Rock Tic-Tac-Toe, the perfect outdoor game for all ages. Help your child develop thinking skills and get away from the TV!

Science fair project that demonstrates the process known as refraction, which allows glasses and contact lenses to help people with poor vision.

Science fair project that demonstrates how stalagmites and stalactites are formed.

This science fair project idea provides evidence that air is everywhere and takes up space.

Encourage your kindergartener to investigate and chronicle the weather she observes during the coldest months of the year.

Help your kindergarten scientist explore an important part of earth science: how soil retains water.

In this experiment you simulate radioactive decay in order to gain an understanding of the basics of half-life.

How powerful is the reaction between baking soda and vinegar? Find out here!

Learn how to grow an avocado plant indoors with your 1st grader in this hands-on gardening activity.

In this science experiment, observe convection currents forming and learn about how heat energy moves in liquids from hot to cooler areas through convection.

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

Do you think heat can affect a plant's growth rate?

In this activity, your kid will watch coal turn into crystals right before her very eyes, and learn some science along the way!

Your second grader will love this simple soda bottle race car activity. Make a ramp and customize your car for an entertaining way to learn scientific concepts.

In this hands-on activity, kids learn what it takes to foster seedlings into full-grown plants, all in a regular old soda bottle!

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.

Check out this fun science fair project idea to learn how alkaline batteries convert chemical energy to electrical energy?

In this challenge, students are tasked with creating a model roller coaster that a marble can travel through.

Here's a fun activity to reinforce the physics concept of stored energy for your middle schooler.

Here's a science experiment that gives your kids a chance to see how fire needs oxygen to burn, with a little math and writing practice thrown in.

Create your own light bulb and test filaments of different thicknesses to see which keeps the bulb burning for the longest time.

Check out this fun high school science fair project idea to investigate how the cell membrane regulates what moves into and out of cells.