Match the shapes with the containers used to make them.

Help lift this Obelisk monument by designing a lever to do the job as efficiently as possible.

Design your own trebuchet catapult, launch the sandstone balls, and destroy the castle. Decide on the size of your projectiles, where to place your trebuchet, and other factors critical to success.

Take a closer look at the space robots Spirit and Opportunity, and their scientific instruments used for exploring the surface of Mars.

Get the facts straight about the hazards of smoking. Take interactive quizzes, participate in virtual teen surveys, and read answers to current questions about tobacco use.

Teachers' Domain is a multimedia digital library for the classroom that provides learning experiences in ways no textbook can. This ever-expanding library currently includes collections on: Science: Life Science, Physical Science,...