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

How powerful is the reaction between baking soda and vinegar? Find out here!

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.

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

Has your child ever asked you how a submarine works? Here's a simple bathtub project that will make for a hands-on answer.

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

Take this "paper plate snack test" with your child for a hands-on lesson in making healthier choices to teach your child about what's in his food.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

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

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!