Help your child make a beautiful homemade sandcastle that will last!

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.

Slip some science into storm watching with a homemade rain gauge!

In this design challenge, your child will make a bottle rocket using typical household items.

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

In this science fair project, we learn how air molecules move as a result of density, convection, and air currents.

Help your fifth grader trace your family's roots and interview all the living mothers to create a makeshift, 3-D family tree!

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

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.