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Examine how the tire treads of a bicycle affect its rolling frictional force. Change tires, test speed performance on different terrains.

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

Experiment about connection of senses of taste and smell. Using blindfold and noseplugs, administer blind taste test. Analyze results and organize data.

What kind of fabric holds dye best? How can you improve a dyed fabric's colorfastness? In this colorful project, test colorfastness using mordants and bleach.

This experiment investigates whether the psychological phenomenon of the halo effect can be used to explain people's perceptions of others.

What heats up fasterâwater or soil? 5th grade students test the specific heat of water against the specific heat of sand in this great science fair project.

Kids use applied math to build and test a parabolic mirror solar hot dog cooker in this cool engineering science fair project idea for middle school.

Formulate a hypothesis and use the scientific method to determine the guess what is hidden in a box. Test abilities of volunteers, without opening box.

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 explores the question of whether age and/or gender play a role in people's ability to remember dreams.

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.

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

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

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.

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

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.

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

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.

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