NSI International Inc. is a global marketer and manufacturer of creative toy and consumer products including Magic Rocks™, Smithsonian® Science kits, and its own craft and activity brands. NSI’s products can be found in thousands of retail locations in more than 30 countries around the globe.
Smithsonian – Newton’s Cradle
Demonstrates conservation of linear momentum. Swing one ball, or two and observe equal reaction on the other hand!