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

Help your second grader observe the phases of the moon, and then let the fun loose: he'll get to chart his observations with marshmallows!

Kids will learn how to make a thermometer to to explore liquid density in this great science fair project. Which liquids are affected by temperature the most?

By incorporating natural materials and the powers of observation, your child will become a backyard naturalist while building early writing and drawing skills!

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

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

In this science fair project, kids will be able to see where germs reside on their hands while gaining insight into the benefits of thorough hand washing.

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

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.

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

It's rhyme time! With this science fair project idea, your child will find out which words can be considered easy rhyming words, and why.

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

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

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

This science project teaches young students about germs, bacteria, and the importance of washing their hands. Students will test what is the best way to wash.

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

Use pepper and soap to discover some fun facts about the properties of water.

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.

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

In this fun science experiment, kids will determine the best method for ripening avocados and discover the cool chemical reaction that makes this possible.

In this fun design challenge, your child will get creative with making structures out of toothpicks and gumdrop candies.

Are you ready to be a detective for science? Then get out your magnifying glass and start studying fingerprints!

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

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

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?

In this activity, your child will transform an egg into a glowing, bouncy "ball" that they can play with.

In this activity your child will create their very own marble maze!

When you rub a balloon on your head, your hair stands up; but is that true for everyone? Does hair color affect static electricity?

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

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