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Having a blast with my new microscope
(hexbear.net)
Wanna talk about your hobbies or post about them? Here's your spot! From mini painting to cross stitching to crocheting.
Barking up a completely different tree than most comments here, it might be interesting to look at some electronics, like the inside of some integrated circuits. This would be a whole process and require a lot of nasty chemicals (nitric acid is particularly dangerous) though. This is probably a bad idea actually.
Many of them you can just very carefully sand the lid off. Often there's fun doodles!