In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

In this fun activity, your child will create their very own solar oven to bake s'mores!

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

What's the relationship between temperature, air humidity and static electricity? Kids will find out with this free static electricity science fair project.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

What's the difference between a microwave and an oven? Use mashed potatoes to explore which kitchen appliance does a better job at keeping food warm.

What's the quickest way to separate salt and pepper? Let static electricity do the work! Your child will be fascinated by this simple experiment.

Show your child how to construct a homemade thermometer. It's hands-on fun and a great way to learn about this important instrument!

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Make a planter full of delicious seasonings and classic grilling vegetables, great for a Fatherâs Day gift or a fun start-of-summer outdoor activity.

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.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

Roasting pumpkin seeds makes for a great Halloween activity, and a healthy snack!

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

In this science fair project, students create their own miniature salt flats at home.

In this science fair project, students make their own rain gauge to measure rainfall.

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

On the next chilly, winter day, invite your fifth grader to make a hand warmer by experimenting with the loaded combination of a few natural ingredients.

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

Teach your child how to make an all-natural, yellow-brown dye, using just walnut shells and water. This deep dye can be used on textiles, art, and wood.

Introduce your child to the world of motion and physics with a bit of marble play inspired by Sir Isaac Newton!

Show your child that the simplest ingredients (salt and water) can be used to illustrate the concept of density!

To help your child learn how to use a thermometer, try this temperature collecting activity at home.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

Would your dog prefer homemade or store-bought food? Raw or cooked? Test your dog's preferred diet in this fun experiment.

Amaze your kids by separating a salt and pepper mixture using an "electric spoon" charged with wool.

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

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