大象传媒

Noor鈥檚 first interaction with tear gas was on Jan. 25, 2011, the first day of the Egyptian uprising in Cairo鈥檚 Tahrir Square. At 20 years old, he had been to political demonstrations before, but he had never seen so many people in the streets. He soon found out that some of the tear gas being fired in his direction was made in the United States.

(An Egyptian protester forwards a tear gas canister towards the riot police during clashes near the US embassy in Cairo on September 13, 2012. Credit: Khaled Desouki/GettyImages)