Passenger thinks Penn prof doing math is 'terrorist;' flight delayed

Notorious for pursuing instruments of math instruction.

Not just a member, that he was their leader Al Gorithm

This has happened to me so many times at my school. Almost every time I open a terminal in class, someone makes a big deal about it, telling a teacher or everyone in the class I'm hacking something. Teachers don't usually know what to think though so they just ignore it.

Don't remember the source, but I read a few years ago about someone who was using Emacs full-screen on a laptop and drew attention because someone thought he was "hacking"

I believe he was referring to Trump's America as discrimination towards non-Americans and just ignorance in general.