Only glimpses of videos that make it online show the protests convulsing Iran over the death of a 22-year-old woman who had been detained by the nation’s morality police. But those flashes show that public anger across the country, once only simmering, is now boiling. The demonstrations surrounding the death of Mahsa Amini – and the government crackdown emerging to stifle them – represent just the latest cycle of unrest to grip Iran since its 1979 Islamic Revolution. It likely won’t be the last as the Islamic Republic lurches between crises at home and abroad. The window through which the wide…