Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

This science fair project idea investigates which objects float and sink in honey, water, and oil.

This science fair project idea demonstrates how air resistance contributes to denser objects falling faster than less dense objects.

In this activity, young learners will make a balance using a plastic hanger and weigh a variety of small objects using candy corn.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.

This is a quick, easy science fair project that conveys the idea of density to preschool and early elementary children.

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

This fun marbled paper craft uses things you're likely to have around your house, and it teaches kids some simple chemistry too!

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

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

Create a mini plant habitat with your kid to help teach him what it takes to make an ecosystem work.

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

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

Jazz up your patio or backyard with hip and quirky planters made from simple Mason jars.

What is a wedge? Kids find out by experimenting with different wedges in this simple science fair project idea.

Your second grader will love this simple soda bottle race car activity. Make a ramp and customize your car for an entertaining way to learn scientific concepts.

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

This activity provides a solution to all those leaves on your doorstep, while also giving your child a fun science lesson.

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

In this design thinking activity, your child will choose an animal to research, learn about the animal’s habitat, and then replicate the animal's habitat using household items.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

Play with balance and simple engineering as you hurry to create a sturdy rock tower.

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

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

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

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.

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

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

What's the quickest way to separate salt and pepper? Let static electricity do the work! Your child will be fascinated by this simple experiment.