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This science fair project idea determines whether eating before or after exercise is more beneficial to health and performance.

Observe which kind of fresh long-stemmed flower will last the longest after being picked.

Is exercise a cellular activity? Check out this fun science fair project idea to compare the carbon dioxide production before and after exercise.

Study the impact of environment on seed germination among three materials: soil, paper towel, and cloth. Note when seeds germinate and how well they germinate

This project examines whether humans can intuitively grasp numeric values greater than three.

This science fair project idea explores whether boiling and freezing water will have an effect on how much it weighs.

This science fair project evaluates if and how eating a large meal affects ability to perform mental tasks.

Compare different remedies for cooling the mouth after eating spicy food.

This project is about after-images and what possibly affects them.

This project determines how much the rebound rates of tennis balls change after ten games.

This experiment examines if space objects become round after reaching a certain mass.

This project compares the strength of one, two, and three-ply toilet paper.

Determine whether a hot liquid cools off faster when liquid is added before or after a two minute wait.

This experiment will evaluate bacterial content on toothbrushes before and after different cleaning methods to determine which method of disinfecting is best.

Research active ingredients in anti-aging creams. Test skin creams on volunteers, document the effectiveness of the creams with before an after photographs.

Assess physical and mental states of subject before and after drinking coffee. Compare initial expectations with their reported conditions.

Research fruits and their ripening stages, follow and document the different stages. Analyze what causes fruit to continue ripening after being picked.

What can you do with hair after its cut? This science project teaches you practical uses for human hair.

This science fair project idea examines the actual cost of three household light bulbs by testing energy consumption.

The project compares three different methods of testing turbidity in water: the secchi disk, spectrophotometer, and turbidity test kit.

Study the effect of music on blood pressure. Compare blood pressure readings before and after the listening session. Analyze results, write a detailed report.

In this cool project, create a lighted, scale model of the different layers of the Sun, including the core, radiation and convection zones, and photosphere.

Examine which metal conducts more heat by boiling water in 3 pans made of aluminum, copper, and stainless steel.

Discover whether the â5-second ruleâ is effective at determining whether food is still safe to eat after being dropped on the ground.

This project explores how and how much one family can reduce the amount of garbage they accumulate over a three month period.

Store seeds under three different environmental conditions. Plant seeds in carefully marked groups, watch them grow. Compare results.

How do crystals form? In this science fair project, students will use three different saturated solutions to see how different minerals form crystals over time.

Test products which claim to reduce wrinkles, and determine which is the most effective. Test effectiveness over three weeks, using a sample of volunteers.

You've heard all about oil spills, but can they really be that bad? After all, vegetable oil is in almost every yummy baking good from cookies to brownies.

In this open-ended activity, students will be given a small quantity of three types of materials and asked to design a prototype for “something that will improve the school.”