Mathematician and collector.
Flashlight collection
Miscellaneous collection
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My calculator collection.
![A Nixie tube, or cold cathode display,[1] is an electronic device for displaying numerals or other information using glow discharge.](https://image.jimcdn.com/app/cms/image/transf/dimension=500x10000:format=jpg/path/s1a21bc8d7434e9e1/image/i90562152e1a39a4b/version/1445664949/a-nixie-tube-or-cold-cathode-display-1-is-an-electronic-device-for-displaying-numerals-or-other-information-using-glow-discharge.jpg)