Play with balance and simple engineering as you hurry to create a sturdy rock tower.

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.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

What animals are most popular? This project affords practice in data-collection, record-keeping and data-analysis through the investigation of this question.

In this project students experiment with making music using only glasses of water.

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

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

In this project children practice the scientific method while playing with puffy paint.

This science fair project idea examines the reason boats are shaped and engineered.

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

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

This project explores whether plants can live and grow when "watered" with juice, soda, or milk.

In this experiment we will be determining whether birds prefer certain colors of seed.

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.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

This project determines what category of person is most likely to be ticklish.

In this experiment, students will create their own version of coquina, a sedimentary rock thatâs formed by seashells and sand, cemented by seawater minerals.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

examine how passive solar heating works, measure temperature in a parked car on a sunny day. ways to use passive solar heating as an alternative, energy

The goal of this project is to create an exciting topographical map out of dough.

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

The objective of this science fair project is to examine the basic principles of air pressure using simple materials like a balloon, straw and string.

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.

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?

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

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

This science fair project idea investigates whether plants can survive being frozen.

This science experiment has students test whether a snail moves faster on concrete or dirt.