What does yeast eat? Sugar, of course. But yeast also has some powerful enemies in the form of antifungal agents! Kids test them out in this fun yeast lab.

Design and build a scale model representing living tree architecture. Then build a full-size version using one or more lives trees, and test your creation.

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.

Is the birthday paradox really a paradox, or just an intriguing problem that defies intuition? Find out with this birthday paradox science fair project.

This experiment evaluates whether a person's eye color affects their ability to identify colors in low light.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

Check out this fun science project idea on ecological succession and learn the main difference between primary and secondary succession.

Science fair project that tests whether cats have a preference for organic food.

This science fair project idea tests the efficiency of short term memory.

Science fair project which tests which antacids are most potent by measuring how well they neutralize the acid in lemon juice.

This science fair project idea tests whether it is true that humans are in the morning than later during the day/night.

Science fair project that tests the effects of temperature change on the reactivity of the catalase enzyme.

This science fair project idea tests the efficacy of both synthetic and natural antibiotics.

Science fair project idea examines different techniques for memorization. Analyze results of memory tests to determine which method is most effective.

Free science fair project idea that measures change in flexibility with age, using a variety of flexibility tests like Sit & Reach.

What is the best stain remover for clothes? In this fun and easy science fair project idea, students will identify the best method for laundry stain removal.

Science fair project that tests how heat affects the chemical reaction between a seltzer tablet and a glass of water.

This science fair project idea determines if females or males tend to do better on optical illusion tests and whether certain age groups also do better.

This science fair project idea tests whether tall people have the ability to swim faster than people of average and shorter heights.

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

Study how we perceive color by exploring optical illusions such as pointillism, digital images, and Ishihara tests.

Science fair project that tests how well various sunscreens protect skin from the sunâs ultraviolet radiation by measuring their effect on sun-sensitive paper.

This science fair project idea tests for the existence of an ability known as remote viewing.

This science fair project idea lets you build your own wind tunnel and tests different models of paper airplane.

Science fair project that examines oxidation, reduction and chemical indicators by testing for the presence of the iodide in salt.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Salmonella and E.coli are common food contaminates. This experiment measures the time it takes for E.coli and Salmonella to reach hazardous levels in fish.