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

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

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

Introduce your child to the amazing, almost magical phenomenon of static electricity!

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

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

Introduce your child to the world of motion and physics with a bit of marble play inspired by Sir Isaac Newton!

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

Delight your budding scientist with this cool physics magic trick and teach her some basic physics concepts while you're at it!

Ready for takeoff! Make science fun and teach about levers and fulcrums as your child sends buttons flying.

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.

Wool can absorb 1/3 of its weight in water, while still keeping the body warm. She can test this theory by performing a scientific sock comparison!

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

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.

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

How does the size of a vibrating surface affect the pitch of a drum? Learn about drum size and pitch with this easy science fair project idea.