Would you believe that Colleen and I both had a Gilbert Microscope set as kids? Ditomaceous earth, it was stuff they gave you that appeared iridescent under the microscope. Of course, I had a much better medical microscope years later. Unfortunately there is no glowing report or any story that this whetted my desire to become a physician. Colleen and I both exclaimed when we saw the set for sale. She had a great time looking at all manner of things. Somehow I knew this plastic thing was too juvenile for my eventual adult pursuits in medicine.