Scientists at King Abdullah University of Science and Technology (KAUST) in Saudi Arabia have developed a tiny “claw machine” that is able to pick up and drop a marble-sized ball in response to exposure to chemical vapors.Scientists at King Abdullah University of Science and Technology (KAUST) in Saudi Arabia have developed a tiny “claw machine” that is able to pick up and drop a marble-sized ball in response to exposure to chemical vapors.[#item_full_content]