Find out whether cast iron or regular teflon pans heat up faster and also retain their heat longer.

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.

This project tests the hypothesis that dark colors absorb more heat than light colors.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Dive into the world of cooking oil and smoke points to discover just how fast some oils start smoking.

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.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

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.

Students pit the heat capacity of water against the heat capacity of oil while looking at the effects of dipole rotation in this cool science fair project idea.

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.