In-N-Out Burger removed No. 67 from its ordering system after the viral "6-7" meme reportedly caused chaotic disruptions by teenagers at restaurant locations.

Editorial Note: Forbes Advisor may earn a commission on sales made from partner links on this page, but that doesn't affect our editors' opinions or evaluations. Learning a different language is tough ...

Some of us might solve crossword puzzles or Sudoko games to exercise our minds, but [Nathan Nichols] plays with exotic number systems to keep the brain cells in shape. He wrote the Hanoi C99 library ...

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