Drone swarms for high-speed low-cost temporary housing construction -- A shipment of bricks arrives at a disaster area or refugee camp by helicopter or truck,

Drone swarms for high-speed low-cost temporary housing construction -- A shipment of bricks arrives at a disaster area or refugee camp by helicopter or truck, drones file into a holding pattern around it, the bricks are dispersed into the air by explosives, each drone catches one flying brick with a claw before it hits the ground, and then the drones cooperatively build a structure by individually placing each brick where it belongs. It's a great technical challenge and also great for humanity.