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Tin can phones offer something modern versions don't—a fun project to make with a friend, and a dramatic illustration of vibration and sound waves.

This experiment examines whether social orientation (extroversion or introversion) is correlated with memory.

This simple "how to make a water wheel" activity makes physics come alive for your child by demonstrating how different kinds of energy work.

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

This activity is a great introduction to polymer chemistry. It might seem complicated, but all you'll need is the material found inside of a baby's diaper!

Science fair project the demonstrates Newton's Third Law using a milk carton filled with water.

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Help your child create a working lung model that fills with air just like the lungs inside of his own chest when he breathes.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

In this science fair project, students examine how the flow rate in a stream affects the growth of aquatic plants.

Before Twitter, birds were the ones tweeting, not humans. Have your child discover the magical sounds of nature while recording birds around his neighborhood!

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

In this fun science experiment, make a balloon car and test it on different surfaces to learn about sliding friction and rolling friction.

Help your child create a magical miniature garden in the most unlikely of places: a recycled plastic bottle!

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.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Make a periscope with milk cartons and mirrors! This preschool activity is great for playing secret agent and learning simple physics.

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

Create a soda bottle garden that defies gravity! This hanging terrarium is housed in a soda bottle and perfect for crafty kids with a growing green thumb.

This science fair project idea shows how a vibrating object transfers energy to whatever it touches.

In this cool elementary school science fair project idea make a model to learn what happens to the Earth's surface when ice moves over land.

Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!

Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.

This simple activity is not only fun, it's also a useful way to organize children's closets — and offer kids some autonomy to boot.

Construct and experiment with a periscope using reflected light rays to gather an image.

Make edible amber fossils with your second grader to explore the fascinating world of science!

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Experiment with buoyancy to learn how a submarine rises and sinks in this classic science experiment.

Grow a garden with an environmentally-friendly twist by using plant scraps that usually get thrown away.

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.