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

This experiment will determine how different kinds of light affects the strength of bakerâs yeast.

In this experiment, recycled objects are separated to demonstrate how mixtures are made and the variance in the physical properties of their ingredients.

Melt the ice, but save the lawn. The objective of this science fair project is to explore the effects of different substances on melting ice.

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.

Study blind spots, run experiments in blind spot detection, design an original blind spot experiment, test your design on volunteers

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

Find out whether putting something on top of a plant will inhibit its growth.

This science project helps students gain understanding of bioluminescence, the phenomenon that allows fireflies and glow worms to give off light.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

This science experiment has students test whether a snail moves faster on concrete or dirt.

Make a list of items that need repurposing such as e-waste, batteries and mattresses. Invent your own original repurposed design.

Explore the best way to store popcorn kernels. It examines the impact of moisture and temperature on unpopped kernels.

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

In this experiment you will evaluate whether praise improves athletic performance.

Science fair project that cultivates slime mold and monitors the stages of its development.

This experiment determines the distribution of darts around a bulls eye to simulate the probability of an electron's location in its own cloud of electrons.

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.

Does nail polish really slow the growth of nails? Explore in this science fair project idea.

Study history of aerodynamics of arrow design to create a perfect arrow. Test arrows by shooting at an archery target.

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

How much gas is released into your stomach by your favorite beverages? This project examines which beverages produce the most gas.

Science fair project that determines whether brain size is correlated with intelligence.

Do males really prefer listening to male than female singers? Find out when exploring this science fair project!

This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

Use chemical analysis to identify a variety of mystery powders that look the same but actually have very different properties.

Are red apples really sweeter than green apples? The objective of this science fair project is to test the theory with quantitative evidence.

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.