Using the radioactive decay present in a banana to generate random numbers. Even if you don't appreciate the math/code/hardware behind it, you can appreciate the aesthetic of this Arduino-based generator and banana holder.
Quick explanation: https://www.hackster.io/news/the-just-bananas-method-for-generating-true-random-numbers-0e67c763dc1a
More complex (including code and math/probability), from the developer: https://www.valerionappi.it/brng-en/
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