This cool science fair project teaches kids about temperature, density and buoyancy using balloons that float with normal air. No helium required!

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

This science project has students study a group of volunteer liars actively lying to study the behavior of a lie. Students see if they can figure out the truth.

Find out which type of sponge holds the most water.

Learn with makes water molecules work with this fun and easy science activity!

Make some easy homemade yogurt with your young scientist, and see what a few 'live' bacteria can do in the right conditions!

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

In this challenge, students are tasked with creating a car that can be powered by a balloon!

Children combine an acid and an alkaline substance to simulate a volcano eruption in this fun experiment.

This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!

Who knew that you could make beads out of rose petals? Not only can it be done, but the beads smell wonderful!

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

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

Kids will learn about the interaction of lactose and lactase in milk and discover why we describe enzymes as catalysts in this fun science fair project.

In this experiment you observe and determine how well your cat uses his whiskers to navigate through a maze.

Who needs paint, glitter, or crayons when you have natural art supplies right outside your front door?

Magic, science, or household cleanser? Let your second grader decide with this practical, nontoxic chemistry experiment with acids and bases.

What's the chemistry behind dyeing Easter eggs? Will adding vinegar to dye help the eggshell absorb the color? This colorful science project has the answers!

What causes sound? Here's a simple science experiment that adds a visual element to the science of sound to help kids better understand this tricky concept.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

In this science fair project, students create their own miniature salt flats at home.

Do you love to make Jell-O? Find out in this science fair project idea if it is possible to make Jell-O with just warm water.

In this enlightening transpiration experiment, kids will explore how the loss of water from plants through transpiration contributes to the water cycle.

Teach your creative second grader about proportions, animals, and proper cutting methods with cucumber carving.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.

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

How does frost form? How fast does it form? Do this simple science project using a plastic glass, rock salt and some water to learn about deposition.