What is a barycenter? Kids learn how gravity and mass influence the orbit of binary systems like planets and moons or stars and planets in this cool experiment.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Science fair project which measures the shadow cast by a meter stick at various times in order to predict the circumference of the earth.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

This experiment challenges students to forecast the weather based on the surrounding areas' weather.

What makes your shadow dance around all day? Let's play detective and find out why that sneaky shadow never stays in one place for long.

Kids use applied math to build and test a parabolic mirror solar hot dog cooker in this cool engineering science fair project idea for middle school.

In this activity, you child will learn about how heat changes food. On the next sunny day, head outdoors to make a treat in an outside oven! Here's how:

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

Check out this cool and free middle school science fair project idea on how to make a solar oven.

This project is a vivid, concrete introduction to the basic but important idea that plants need sunlight and water to grow.

This science fair project idea explores whether a sundial is as accurate as an atomic clock when telling time.

Have your child make a special mobile inspired by the weather outside. Learn about seasons, the environment, and art in 3D.

What direction should solar panels face? It's not the direction you might think! This free and enlightening science fair project helps kids discover the answer.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

In this science fair project, students focus sunlight with a magnifying glass and trap shorter waves to melt ice.

In this arts and crafts activity, you and your child will create colorful three-dimensional artwork using scrunched-up fabric pieces.

Melted crayon art is all the rage right now. It's simple, inexpensive, and there's no wrong way to do it!

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Explore the changing seasons with your preschooler by helping her create a cork-stamped masterpiece.

Follow these easy instructions to make a working sundial with your kid! Find out what other cool things the Aztecs created in this activity.

Create a brush pile to help wintering wildlife stay warm and cozy through the winter.

Introduce your fourth grader to the concepts of solstices by observing the length of her shadow on the shortest day of the year, compared to other solstices.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

Calculate the mass of the Earth using the sidereal and calendar period of the Moon and Newton's Law of Universal Gravitation in this physics science project!

This sunshiny art project is perfect for a rainy day and it helps preschoolers with fine motor skills.

Why do plants wilt? Kids will learn to think critically about what environmental factors affect plants, and what plants need to survive.

Science fair project that determines which types of clouds are best at blocking harmful UV radiation.

Science fair project that compares tree leaf size and shape based on the leaf's position in the tree. Is their is a noticeable difference between high and low?

Use applied math to model orbital eccentricity in this cool science fair project for 7th grade.