This science fair project idea explores how length affects the weight a bridge can hold.

Future engineers, unite! Discover how to keep a sandcastleâs bridge from falling into the moat.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

This science fair project idea builds models of various types of bridges and then determines which bridge design is the strongest.

In this science project, the center of gravity is explored.

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.

Science fair project that tests the effects of temperature change on the reactivity of the catalase enzyme.

This science fair project idea examines reptile behavior and to determine whether reptiles are more active during warmer temperatures.

This baseball science fair project explores the concept of an object's center of percussion to determine if the "sweet spot" has a scientific basis.

In this plastic wrap science fair project, you'll learn about polymer permeability and find out which plastic wrap keeps food from dehydrating best.

This science fair project idea tests the effect of heat- at varying temperatures- on the viability of biological enzymes.

How does bleach kill bacteria? Kids find out in this impressive bacteria science fair project by testing different concentrations on a safe strain of E. coli.

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.

This play-activity causes young children to focus on and become more aware of their sense of hearing and the power of their ears.

This science fair project determines which type of physical activity most improves memory.

Help your child get to know the least-appreciated of the five senses, the sense of smell, with a smelling station.

Learn about emulsification and bile's roles in digestion, and investigate how the digestive enzyme lipase breaks down lipids.

Is exercise a cellular activity? Check out this fun science fair project idea to compare the carbon dioxide production before and after exercise.

Get your child math and science savvy with this fun outdoor classification game. Using chalk, your child will classify what she sees in the natural world.

2011 VIRTUAL SCIENCE FAIR ENTRY: The objective of this science fair project is to develop a microcontroller and circuit that can conduct electricity.

This science fair project idea examines liquids of different densities.

Science fair project that explains and demonstrates the parallax principle.

The objective of this science fair project is to investigate salt water density.

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

This science fair project idea examines readersâ expectations in regard to literature.

This science fair project idea demonstrates the process of land erosion.

This science fair project teaches students the differences between fruits and vegetables.