Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

Get your hands on a concoction that breaks the rules about what's a solid and what's a liquid.

Play this flashlight game with your child to teach him about objects that are transparent, translucent, and opaque.

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

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

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