I am not sure what is more disturbing: the ease with which irrational passengers can get other people thrown off flights or the dismal state of math in the United States that calculations are now unrecognizable to many passengers. University of Pennsylvania economics professor Guido Menzio, an award winning mathematician, was asked to leave a flight from Philadelphia to Syracuse because a woman sitting next to him panicked at the sight of his scribbling some strange code on papers. It turns out Menzio was trying to solve a differential equation. Ironically, the very fact that he was using a plus sign in his equations showed that he was not an Islamic extremist.
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