See also http://www.philly.com/philly/news/20160508_Passenger_thinks_Penn_prof_doing_math_is__quot_terrorist__quot__flight_delayed.html http://www.philly.com/ph

See also http://www.philly.com/philly/news/20160508_Passenger_thinks_Penn_prof_doing_math_is__quot_terrorist__quot__flight_delayed.html http://www.philly.com/philly/news/20160508_Passenger_thinks_...