In this experiment, young ecologists will learn about a type of edge effect: how trees and plants at the edge of a forest can act as a weed filter.

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.

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

This science fair project idea investigates whether plants can survive being frozen.

This science fair project idea explores the different properties & interactions of sugar molecules.

This experiment explores whether reading text on a computer screen or type on paper leads to better retention of the information read.

This science fair project examines how seeds hitchhike on animals and clothing.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

This science fair project idea explores substances that cause a bubble to last longer.

Science fair project that determines whether lettuce that is harvested gradually yields more produce than lettuce that is harvested all at once.

Could there be toxic chemicals lurking in the cupboards and closets of your home?

Did you ever add salt to pasta? Did it help cook the pasta faster? If not, find out in this science fair project idea.

Discover how to make fake snot with this cool science fair project idea to learn about polymers, enzymes, and more.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

This science fair project idea measures the growth of bread dough and finds out how long it takes for the dough to stop rising.

Free science fair project idea that examines the differences between cats and dogs. Analyze objective qualities rather than subjective ones.

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

This science fair project focuses on the use of the enzyme amylase found in human saliva to break down starch into sugar.

This fun science project helps to investigate how much water can a plant take up and release in a certain period of time through the process of transpiration.

Science fair project which evaluates different athletic shoes in order to find out whether any of them affect a person's ability to run.

This science fair project idea determines what household items are good conductors of electricity.

Discover which fabrics shrink the most in the wash and why.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

This science fair idea examines hydrogel superabsorbent polymer crystals. They can absorb 500 times their weight in water. Can they absorb other liquids too?

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

Here is a cool and easy science project to determine the rate of chlorophyll breaks down and how it affects the color change of grass from green to yellow.

This science fair project idea determines the most effective method of preserving food.

The goal of this science fair project is to analyze differences between the taste and texture of frozen and fresh food.

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