This science fair project idea demonstrates that light travels in straight lines and experiments with reflecting light.

Your child will do a fun science experiment using soap and pepper flakes to help understand the concepts of water molecules and the surface tension of water.

Test whether plants can grow without sunlight and water.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

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

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!

This balloon-powered car project is a great way for your kid to learn about energy and how it can be used efficiently.

Create a brush pile to help wintering wildlife stay warm and cozy through the winter.

Help your child experiment with the combination of acid and baking soda by making these homemade bath bombs!

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

This science fair project idea explores the egg's thin membrane.

Help your child understand the scientific concept of evaporation with this fun outdoor science activity.

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.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

In this physics project, learn about the relationship between light intensity and distance using a laser pointer, flashlight, and graph paper!

Have your child build his own mini waterfall, and help him develop his planning, problem solving, and architectural skills.

The purpose of this science fair project is to determine which conditions and materials quicken the composting process to make the best compost.

This project compares the strength of one, two, and three-ply toilet paper.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

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

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

Milk is made of water and fat; but how can you separate the two? Find out in this color changing milk experiment.

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

This is a fantastic and easy science experiment where kids will learn about elasticity by testing how high bouncy balls of different materials can bounce.

This weather spinner will improve observation skills by encouraging children to examine and track weather details and patterns.

This science fair project teaches students the differences between fruits and vegetables.

This science fair project idea determines which method of hand cleansing is the most effective.

Put your second grade scientist to work this Fourth of July with our colorful "liquid fireworks" project!

Examine the effect of pressure on carbonation in soda.