Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

Test whether plants can grow without sunlight and water.

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

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

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

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

Kids learn how to prevent erosion by growing grass. They'll test soil with grass against raw soil in this revealing science fair project idea for 4th grade.

Explore if planting seeds in a certain direction will affect how fast it germinates.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

What are the effects of fertilizer on plant growth? What's the best fertilizer type (solid, liquid or powder)? Kids find out in this science fair project idea.

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

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

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

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.