Earthquake Retrofit shares this article from the Associated Press: "An Ivy League professor said his flight was delayed because a fellow passenger thought the math equations he was writing might be a sign he was a terrorist... He said the woman sitting next to him passed a note to a flight attendant and the plane headed back to the gate. Guido Menzio, who is Italian and has curly, dark hair, said the pilot then asked for a word and he was questioned by an official... "They tell me that the woman was concerned that I was a terrorist because I was writing strange things on a pad of paper..." He was treated respectfully throughout, he added. But, he said, he was concerned about a delay that a brief conversation or an Internet search could have resolved. "Not seeking additional information after reports of 'suspicious activity'... is going to create a lot of problems, especially as xenophobic attitudes may be emerging."