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

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

In this science fair project, students create their own miniature salt flats at home.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

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

This science fair project idea demonstrates that light travels in straight lines and experiments with reflecting light.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Science fair project that examines how winter storms form and the relationship between temperature, moisture and snow.

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

In this science fair project you will make a model of a cell membrane using very simple material.

Science fair project that examines condensation and the conditions needed in order for dew to form.

In this science fair project, apply the principles of leverage and force by building six simple machines designed to set weights in motion.

What does a raindrop look like when it splashes on the ground? Is each raindrop unique like snowflakes? Find out how raindrop size varies in this experiment.

Find out whether a longer airplane will fly farther or a wider paper airplane.

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 project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

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

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

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

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.

This science fair project idea explores the egg's thin membrane.

Examine the effect of pressure on carbonation in soda.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

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

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

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.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

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

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.