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

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

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.

Check out this fun science fair project idea for 1st grade: a solar eclipse model that demonstrates total, partial, and annular solar eclipses.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

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

This science fair project idea's objective is to become familiar with items your family regularly throws in the trash.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

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

Which music genres have the fastest tempos? The slowest? This experiment determines if there's a relationship between beats per minute in a song and its genre.

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

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

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

In this project combining nature, art, math, and science, children make rubbings of leaves then observe shapes and structures and sort the leaf images.

Find out whether we can create motion in a dish and as a result, create a wonderful and colorful show.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

In this science fair project, young children discover what happens when two fluids that have different densities get together.

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.

This engaging project encourages young children to practice and refine the important scientific skills of sorting and classification.

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.

Using a toy race car kids create a visual model of the Doppler Effect.

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.

Test whether plants can grow without sunlight and water.

This science experiment tests whether warm or cold water works best in making cut flowers last longer.

This science fair project idea investigates how magnetism can defy the force of gravity.