(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Easy or Hard (2682)
        
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       "Friction-driven static electrification is familiar and
       fundamental in daily life, industry, and technology, but its
       basics have long been unknown and have continually perplexed
       scientists from ancient Greece to the high-tech era. [...] To
       date, no single theory can satisfactorily explain this mysterious
       but fundamental phenomenon." --Eui-Cheol Shin et. al. (2022)
        
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