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

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

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 explores whether the process used to dry the beans we eat for food renders them unviable.

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

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

This science fair project idea compares biodiversity between drops of water.

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.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

Will storing cucumbers and tomatoes in the fridge destroy their unique flavors? Find out in this science fair project idea!

In this project, the affects of vitamin E are observed on a rose petal.

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

This science fair project teaches students the differences between fruits and vegetables.

This science fair project idea examines the reason boats are shaped and engineered.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Test out the pH levels of soil in your backyard versus soil in more wild environments to solve this science case.

Science fair project that identifies the differences between soils from different environments and attempts to figure out why those differences exist.

Science fair project that determines whether tapping a pomegranate with a spoon helps it release its seeds.

This experiment has students record rat behavior to learn about the benefits of rats and research rat myths throughout history.

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

This science fair idea project identifies the active ingredients in soap and experiments with the properties of soap.

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 are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

This science fair project idea investigates the difference in reaction times between boys and girls.

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

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 hands-on design challenge your child will make their very own Rube Goldberg Machine.

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

This science fair project idea explores whether it is easier to balance on a narrow ledge or on a rope.