A man prays on a rooftop during Ramadan afternoon prayers in Jerusalem. For the world's 1.8 billion Muslims, the holy month of Ramadan is a social and spiritual high point of the year, a time to gather with friends and family and to focus on fasting and prayers But the COVID-19 pandemic is transforming this Ramadan in unprecedented ways in societies across the globe, clearing out mosques, cancelling communal prayers and forcing families to replace physical gatherings with virtual meet-ups.