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

When you cut a flower to put into a vase, it'll eventually wilt, even with water and sunshine. But is there another scientific secret to keeping flowers fresh?

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.

This science fair project teaches students about wilting and browning of salad greens.

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

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.

Is it possible to trick the forces of nature that make your bubbles round to create a square bubble?

Ever wondered how a plant drinks water? This science project will teach you how and help you create a beautiful floral display!

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

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.

This science experiment tests why guacamole goes brown and if leaving the pit in will stop guacamole from turning brown.

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

This science fair project idea investigates if webbed feet help a duck (and others) swim.

This classic children's game demonstrates how sound travels through air vs. through a solid.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

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

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

This science fair project examines how seeds hitchhike on animals and clothing.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

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

Be a chemist for a day and study the simple reaction between sugar and heat. Try heating sugar and see what happens!

Is it a square or a circle? See if you can trick your friends with this zany science project!

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.