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In this science fair project, you'll make a "ghost" appear in a test tube, and learn about what happens when hot water and cold water interact.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Try this simple 2nd grade science experiment to teach your child about the principles of luminosity and light reflection.

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

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

In this science fair project, students use the streak test to tell minerals apart from each other.

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 demonstrates that plants give off water.

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

Help your child understand the scientific concept of evaporation with this fun outdoor science activity.

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

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 fair project will help students learn about non-vascular plants, such as mosses.

Instead of the traditional egg hunt, try this creative variation that will result in a beautiful Easter garden.

Make all-natural dye from vegetables to create gorgeous homemade play-silks!

Inspire your child to learn about an amazing animal as she creates her very own polar bear habitat.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

Does your child always demand to know why the sky is blue, how the sun moves across the sky, or where wind comes from?

Make edible amber fossils with your second grader to explore the fascinating world of science!

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.

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

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

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

This project examines whether people's taste perception is influenced by what they see.

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

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.

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.