A gravel crusher (R) waits for a cart to be emptied of slabs of stone to be crushed at the Cite International des Affaires in N'Djamena, on April 12, 2021. - In the heart of N'Djamena, the capital of Chad, dozens of women surrounded by a swarm of ragged and often skeletal children, along a road or on a huge adjacent vacant lot, without a single shaded point, crush concrete, cement or brick blocks twelve hours a day. (Photo by MARCO LONGARI / AFP)