This would be funny if it weren’t real. When I read this story I first thought it was a remake of the old joke about Al-Gebra (check out the link for a detailed history of this dangerous terrorist movement):
“At New York’s Kennedy airport today, a person later discovered to be a public school teacher, was arrested trying to board a flight while in possession of a ruler, a protractor, a drafting triangle, a compass, and a calculator.
During a press conference the Attorney General said he believed the man was a member of the notorious al-Gebra movement and the FBI intends to charge him with transporting weapons of math instruction. […]”
(from Weapons of Math Instruction, http://daryld.com/weapons-of-math-instruction/)
But alas. This week, a real mathematician, Guido Menzio of the University of Pennsylvania, recipient of the 2015 Carlo Alberto Medal for best Italian economist under 40, was questioned and removed from a flight because a fellow passenger thought that his differential equations were “in Arabic”, he was concentrating too hard, and suspiciously avoiding questions, and the flight attendants had to investigate the complaint.
Dr Menzio was brought back with an apology and the 40-minute flight did leave, with a 2 hour delay.
The whole story (written up with some good humour): https://www.washingtonpost.com/news/rampage/wp/2016/05/07/ivy-league-economist-interrogated-for-doing-math-on-american-airlines-flight/