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!

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Help your fifth grader embrace the roots--literally--of Mother's Day by growing carnations to honor mothers in you family's history.

Does putting soapy water on plants help or hinder plant growth? Kids learn about greywater and how it affects plant growth in this cool science fair project.

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

Help your fifth grader trace your family's roots and interview all the living mothers to create a makeshift, 3-D family tree!

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.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Determine if gender affects the ability to identify different smells.

This science fair project idea identifies trees using a dichotomous key.

Gather some friends for a bubbly soda taste test do determine calories' role in your favorite drinks.

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

Determine whether butterflies like to drink sugar water, salt water, or plain water.

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

The purpose of this study is to determine if people can tell the difference between organic and conventional food from looking at, smelling and tasting it.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

In this experiment, your child will create two compost bins and see if he can determine what attracts fruit flies.

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

Determine which kind of rock (igneous, sedimentary, metamorphic) has the greatest reservoir capacity, which is the ability to hold the most oil and natural gas.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

Is there a relationship between caffeine and heart rate? Students will determine the effect of caffeine on heart rate in this fun science fair project.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

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 focuses on the use of a conductivity device that will determine if a substance dissolved in water can or cannot conduct electricity.

In this science fair project, kids observe the expansion of liquids when frozen and determine if some liquids expand more than others in the freezing process.

What chromosome combinations determine a fetus gender? Use probability to think about whether a sperm and ovum will create a male or female in this project.

In this fun project, use a memory game to test various age groups and determine whether aging directly affects short-term memory loss.

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.

Can a toy car determine the strength of a magnet? In this cool magnet science fair project, young scientists will learn how to measure the strength of a magnet.