Firouz Naderi, an Iranian Nasa scientist, a former programme manager for Mars exploration, paid his tribute on Instagram. “A light was turned off today, it breaks my heart… Gone far too soon.” He later tweeted: “A genius? Yes. But also a daughter, a mother and a wife.”There was an exceptional outpouring of tributes to Mirzakhani both in Iran and outside. Iran’s president, Hassan Rouhani, said: “The grievous passing of Maryam Mirzakhani, the eminent Iranian and world-renowned mathematician, is very much heartrending.” Rouhani also retweeted an image of her bare-headed.