This science fair project idea highlights decomposition rates by comparing how long it takes an item to decompose in a compost pile vs. a landfill.

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

How does light affect plant growth? Do different colors of light work better than others? Find out in this classic science fair project idea.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

Check out this fun and easy science fair project idea on germination of a seed and learn to identify exterior and interior parts of a bean seed.

This science fair project teaches you about what makes persimmons so tart and how astringency can be removed by studying the effect of tannins on fruit.

This science fair project idea explores if objects dropped from a high distance will equal a greater impact force than the object dropped from a low distance.

Are your taste buds up for the challenge? Put tongues to the test with this science fair project that examines who enjoys sour flavors more, adults or kids?

This project explores the interaction between air pressure and playing surface in determining a basketballâs bounce.

This project examines whether playing music during class helps students learn or if it distracts students from learning.

The thermometer outside is dip, dip, dipping! What kind of clothes will keep you warmest this winter? This project determines which materials insulate best.

Design a survival kit. Brainstorm various survival scenarios. Address basic human requirements and natural resources. Describe each tool as well uses.

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

This experiment will explore if and where fractals can be found in the natural world.

Marshmallows are made of sugar, water, and air pockets. Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?

This project compares the national anthems of several different countries to determine if there is a correlation between tempo and a country's latitude.

This project uses toy cars to determine how friction and gravity affect cars and braking.

With help, your fifth grader can sew her own version of this pin cushion currently available at many craft fairs.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

This project examines which style of central-air system filter traps the most particles from the air.

Compare the ignition rates of various types of flame-retardant materials.

This project determines how much the rebound rates of tennis balls change after ten games.

How do cold packs work? Explore endothermic reactions by comparing the temperature change that results from various chemicals added to water to find out!

Kids learn about Brownian motion, diffusion, and how temperature is a key factor affecting the rate of diffusion in this cool science project.

Test out various brands of permanent markers to see which one is least water soluble.

Determine whether the relationship between a personâs armspan and height are genetic.

Here's an arts and crafts activity for preschoolers and pre-kindergarteners: build brick buildings with homemade mud bricks made from dirt and water.

Examine the effect of pressure on carbonation in soda.

This project explores how and how much one family can reduce the amount of garbage they accumulate over a three month period.

This project examines how temperature affects the volume of gas in balloons.