You can use this rubber stopper to contain liquid in test tubes and flasks. Fits tightly to prevent chemical leaks. Highly recommended for use in the science classroom or when displaying a science project!
With this kit, you can conduct 25 experiments to learn how an electric motor converts electricity into motion, and how an electric generator does just the opposite, converting motion into electricity.
Cool new Pi tee featuring ultra soft and light blue 100% cotton shirt.
This genuine meteorite is great for the rock collector in your family!
Command robotic creations with this cool construction kit!
Build your own windmill generator kit by recycling a plastic bottle!
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.