Two 38 mm spherical lenses; one is a double concave, the other a double convex, each with a focal length of 150mm. When placed together the net focal length is zero. (1-1/2" x 1-1/2" x 1/4"; .005Ib).
Great for optics experiments in the lab or classroom.
A massive mounted set of 100 rocks and minerals found in the US,
This toy combines the wonders of Sea Monkeys and glow-in-the-dark fun, all in one!
This simple but amusing magnetic toy will keep you busy for hours!
See the solar system in action!
This kit focuses on teaching children about electricity and how electronic devices work!
Shake the Pet Tornado clockwise and watch the mini tornado funnel form before your eyes!
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