This science fair project uses paper chromatography to investigate whether black, brown, orange, and purple are pure colors or mixtures of other colors.

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

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

Here's a fun activity that will introduce your fourth grader to the concept of frictionless motion by constructing a hovercraft.

Use simple items to create a kindergarten "grow box" that lets a kid see just how salad plants send down their roots and grow underground.

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

Grow potatoes in a plastic bag—easy to grow and harvest, and yummy to eat!

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

This science fair project idea investigates if fats add to the flavor of food.

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

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

Let your fourth grade chef mix up butter and sugar with scientific principles about different states of matter, and get delicious toffee, too.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

Soil and energy don't go together, right? That would be as bizarre as a pairing of peanut butter and marshmallows! Well, actually...

Making your own glass cleaner is easy, effective and inexpensive!

How would you dry your wet clothes if your dryer didn't work? Find out with this fun experiment!

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

The goal of this science fair experiment is to demonstrate the effects of air pressure on objects and analyze applications of air pressure principles.

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

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 science project teaches students to classify different shapes of leaves.

Roasting pumpkin seeds makes for a great Halloween activity, and a healthy snack!

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.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.