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 free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

How do icicles form and what do they look like? Do this free science fair project and watch the formation of icicles occur right before your eyes.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

In this science fair project, learn how a mineral streak is made and how it can help identify an unknown mineral.

This project examines whether playing music during class helps students learn or if it distracts students from learning.

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

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.

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.

Science fair project that examines how to grow bacteria in a controlled setting, using simple materials from around the home.

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

Kids discover what a homogeneous mixture is by adding sugar to distilled water and identify the various factors affecting solubility.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

Learn about magnifying glasses, concave lenses and inverted images by sending rays of light through a magnifying glass in this cool science fair project!

Stories change as you retell them. The objective of this science fair project is to demonstrate how information gets interpreted, distorted and changed.

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

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

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

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!