Haha indeed they were great as frisbees and to make some fancy art projects where you required reflecting surface. Another good thing was the CD/DVD lens. Combination of those from broken CD/DVD readers of laptops with a webcam would make good homemade digital microscopes (good for high school science projects)
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Love it! Wish I had one now...
Now you can just get a foldscope. I got one for free at some conference bit irritating though but not bad for giving it to kids.