The purpose of this science fair project is to learn which substance best preserves apples. Learn about enzyme interactions in fruit and scientific processes.

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.

Brine shrimp usually live in saltwater. Investigate how salt concentration (salinity) affects the rate at which brine shrimp eggs hatch.

Science fair project which examines the relationship between frequency of spider web vibration and spider's response time.

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

If you're looking for something to keep your kid busy on a warm day, and give him some writing practice in the process, bring on the mud!

Test for a correlation between perceived color and heart rate. Using a stethoscope and stop watch, measure the heart rate (beats per minute) of volunteers.

This science fair project idea outlines the practical applications of particular origami folding techniques.

In this science fair experiment about recycling, demonstrate how the wax from a candle can be reused to make another candle.

Excite your fourth grader by recreating ancient Viking myths. This miniature longboat will explore the principle of water molecules expanding when heated.

This science fair project researches the most effective method to cut an onion and stay tear-free.

This experiment will explore if magnetism has any effect on the regeneration abilities of flatworms.

This science fair project teaches kids experimental design and how to test if subjects can really sense if they are being watched.

Explore how you can achieve magnetic levitation with the Meissner Effect! This cool science project explains formation and applications of a superconductor.

The objective of this experiment is to evaluate the effects of acid rain on plants.

Learn about calorimetry, make a bomb calorimeter, and experiment with combusting different nuts to see which one produces the most energy!

Get a cool science project idea on a photovoltaic cell and explore the various factors that affect the energy output of the photovoltaic cell.

Find out which part of a flame burns wood the fastest and also if this is true for all types of flames such as candle-flame, burners, and lighters.

Science fair project that tests the correlation between outdoor temperature or weather conditions and the number of visible stars at night.

Check out this mind-blowing experiment in which a hard-boiled egg will fit through an impossibly small opening with the help of only a few matches!

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

What is a compound microscope? Kids find out by making one of their own in this cool science fair project.

Crayons aren't just good for creating colorful masterpieces -- they're also great for science!

In this activity, you child will learn about how heat changes food. On the next sunny day, head outdoors to make a treat in an outside oven! Here's how:

Create a mini plant habitat with your kid to help teach him what it takes to make an ecosystem work.

Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!

This exploration of different types of energy will help young minds appreciate and observe thermal, kinetic, mechanical, and other forms of energy.

This science fair project determines how age affects the speed that someone can change the focus of their eyes between near and far sightedness.

Before you get ready for a delicious scramble or omelet, add a bit of science to your morning routine!

Have your child build a model of a coral polyp, one of the tiny animals that composes a coral reef.