4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This science fair project idea determines if the color of light affects the growth of plants.

This science fair project idea experiments with spinning color wheels and optical illusions.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

In this project, the fingerprints of family members are compared to determine if people from the same family have similar fingerprints.

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.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

Have you ever seen fruit decay? Find out if a fruit will rot faster if you open it versus leaving it untouched!

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

What combination of cloth and stain will be the easiest for removing stains? Test and experiment!

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

This science fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

In this science fair project, students make their own rain gauge to measure rainfall.

The purpose of this science fair project is to study the properties of sugar and examine individual preferences for sugar and other sweeteners.

In this experiment you will replicate the mummification process by making a hot dog mummy.

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.

Study the life cycle of the common blowfly as it relates to forensic investigation. Record the first time you see flies, maggots, and eggs.

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

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?

This science fair project idea creates cool new colorful fabric pattern designs and experiments with the mixing of colors.

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

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

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

This science fair project idea researches how your choice of clothing affect how hot or cool you feel during the day.

This science fair project idea explores whether white light can be separated into different colors.

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.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.