See also <a href="http:&#x2F;&#x2F;www.philly.com&#x2F;philly&#x2F;news&#x2F;20160508_Passenger_thinks_Penn_prof_doing_math_is__quot_terrorist__quot__flight_delayed.html" rel="nofollow">http:&#x2F;&#x2F;www.philly.com&#x2F;philly&#x2F;news&#x2F;20160508_Passenger_thinks_...</a>