High-quality weight with a hook fitted through the center allow you to hook weights together in tandem or use them one at a time.
Pass-through hooks are included on both sides of the weight!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Investigate the most important phenomena in biology, chemistry, and physics by conducting more than 100 fun experiments!
Create currents and discover gravity while exploring the theory of Lenz's Law with this kit!
Ever wonder how to survive in the wilderness? These cards can help!
This ultimate chemistry set features 250 mind-boggling experiments!
This mirascope creates a 3D hologram image!