When a hospital needs to rush a delivery from a lab somewhere else in a densely populated city–for example, when a surgeon needs an urgent biopsy of a tumor in the middle of a surgery to determine how much tissue to remove, or a gunshot victim in the ER needs blood that the hospital doesn’t have in stock–that delivery can sometimes get stuck in traffic. Couriers are also expensive. In Switzerland, hospitals and labs will soon begin using drones to make those deliveries instead.