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This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

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

In this challenge, students are tasked with creating an insulated cup that will keep beverages colder for longer than a regular cup.

Evaluate the ability of a biodegradable dish detergent to increase the penetration of water in hydrophobic soils.

Give your child a chance to experiment with how things grow. And throw in something extra to up the fun factor even more...her very own grass pet!

The goal of this middle school science fair project is to examine the effect of caffeine on plant growth.

Science fair project that compares leaf pigments of various tree species. Which tree species do you think will have the most pigments and why?

This science fair project explores different types of endangered frogs, and why some are endangered while others are not.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

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 will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

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

This kindergarten science activity will help her explore the changing states of matter which transform an egg from raw to soft to hard-boiled.

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

The purpose of this science fair project is to learn which substance best preserves apples. Learn about enzyme interactions in fruit and scientific processes.

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.

The objective of this science fair project is to determine whether there are gender differences when boys and girls view optical illusions.

Science fair project that examines learn how the angle of incidence affects the efficiency of solar panels. How does a solar cell work?

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

This optics-based science fair project idea teaches kids about real and virtual images with a mind-bending candle illusion inspired by Pepper's Ghost.

In this cool psychology experiment, study how companies air commercials to strategically advertise to viewers who will buy their products.

The objective of this science project is to determine whether the brain first processes colors, shapes, or words when given conflicting messages.

This project examines the vulnerability of fruit flies, Drosophila melanigaster, to irradiation. Will exposure result in mutations?

This science fair project teaches students about wilting and browning of salad greens.

Check out this fun middle school science fair project idea on Newton's third law of motion and how you can change the speed of a rocket.

This cool and easy elementary school science fair project idea provides the basic information on the use of our senses to experience the world about us.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Is your little scientist up for a rocky challenge? Let them make their own geode rocks using eggs and epsom salts!

Engineers in training can get started with this simple wheel-and-axle construction activity.