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In this project, create and examine garden mulch to find out what critters live in the messy, muddy layers just above the soil.

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

Alive or not? This yeast experiment you can conduct with your little scientist explores the answer to this timeless question.

Teach your first grade scientist the difference between liquids and solids using maple syrup.

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

Uh-oh! Is that a pill sitting on the counter or a piece of candy?

Kids will explore the corrosiveness of soda in this cool science fair project by leaving pennies submerged in soda overnight.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

What is surface tension? Kids will discover how water-skating insects use surface tension to keep from sinking by making a model water walker.

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Learn how different types of soil affect how animal tracks form in this experiment!

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

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

Wiggly worms are known for staying buried in the soil, but how does that affect plants? Are earthworms and plant growth related?

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

What do worms eat? Kids find out what kinds of rotting leaves and vegetables worms prefer in this cool compost science fair project.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

Camouflage is one of the most important animal adaptations in the African savanna biome. Kids create their own camouflage with this fun science fair project.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.